User Manual
Contents
1. START AED starts a new flux density and starts a new measurement Starts a new measurement cycle cycle measurement cycle a Turns on off the beeps accompanying pulses detecting and buttons pressing Note If the shutter is opened before the background measurement is terminated the measurement of average count rate for beta and gamma radiation y P is started Short pressing means nothing When the button is press and held for more than 5 seconds the dosimeter switches from autorestart mode to infinite acquisition mode and backwards MODE 1 3 2 The detector converts gamma and beta radiation into a sequence of voltage pulses the quantity of which is proportional to the intensity of radiation detected Detector of ionizing gamma and beta radiation is the GM counter of Beta 2 type Circuit of anode voltage generation digital processing control and indication performs the following functions scaling and linearization of detector counting response measurement of AEDR of gamma radiation and surface flux density of beta radiation by means of measurement of the average rate of pulses coming from the detector output measurement AED of gamma radiation by means of measurement of total amount of pulses at the detector output measurement AED accumulation time and real time generation and stabilization of the detector anode voltage control of operation modes of the dosimeter d2. content of the corrosive agents in the ambient air corresponds to the values in the Table 1 1 Table 1 1 Type of atmosphere Content of the corrosive agents Sulfur dioxide gas not more than 20 mg m day Relatively clean not more than 0 025 mg m chlorides not more than 0 3 mg m day Sulfur dioxide gas not more than 20 to 250 mg m day Industrial not more than 0 025 to 0 31 mg m chlorides not more than 0 3 mg m day 1 2 18 Limits of complementary measurement error for all the physical quantities to be measured due to deviation of temperature from normal value per each 10 H5 1 2 19 Limits of additional measurement error for all measured physical quantities at humidity of ambient air of 95 and at temperature Of 35 Cl 10 1 2 20 Dosimeter is resistant to shocks after a free fall from a height of less than 750 mm 1 2 21 Degree of protection provided by dosimeter s casings against ingress of solid items AROMA Este doc a O A A ENE IM AO EO A PA O A A IP52 1 2 22 Dosimeter is stable against electromagnetic interference of 2 grade according to IEC 61000 4 2 95 IEC 61000 4 3 2006 IEC 1000 4 8 93 IEC 1000 4 9 93 1 2 23 Dosimeter is a fire safe product with fire probability of fire not more than 10 year 1 2 24 Dosimeter withstands the exposure of decontamination solutions 1 trisodium phosphate or sodium hexametaphosphate any synthetic detergent 10 20 g l
3. where H is the value of AEDR reproduced by the calibration installation uSv h Oca 1S the uncertainty of the calibration installation from the calibration certificate in per cent The results of calibration are considered satisfactory if the basic relative measurement error for all test points does not exceed the corresponding limits stated in the section 1 2 3 FVKM 412152 005RE 15 4 5 4 Determination of basic relative measurement error of AED of photon radiation Determination of the basic relative measurement error of AED shall be performed with one value of AED equal to 100 uSv Perform calibration as follows 1 Place the dosimeter on calibration installation with rear panel towards the source the center of dosimeter s sensitive area upper rear part of the dosimeter at depth 10 mm shall be located at the central axis of the gamma radiation beam at a distance from the source for which the AEDR value is within the measurement range stated in 1 2 2 2 turn the dosimeter according to 2 3 1 3 start exposing the dosimeter to radiation and turn on the stopwatch simultaneously 4 stop exposure at the AED value of 100 uSv and take readings from the display window AEDR when the statistical uncertainty is less than 5 5 perform no less than three measurements for this test point calculate the arithmetic mean of the measured values 6 calculate the basic relative error 8 in per cent by the following formula 4 3
4. ARDR OI samima raddi essee e ea SAN NA Me 15 2 H where H is a dimensionless unit numerically equal to measured values of measured AEDR in uSv h 5 ABDO iMata saa YE RAA WA PATKA 15 1 2 4 Energy dependence relative to 0 662 MeV uuuaea aaa aaa aaa aaa cece cece eeeeeaaes 23 1 2 5 Anisotropy of dosimeter for incident radiation in the solid angle 60 relative to principal measurement direction perpendicular to the upper rear part of the dosimeter for radionuclides Cs and Co 125 Vos Forradionaclid AM aoi a eb ea GOA KAY 60 1 2 6 Energy range of measured beta radiation 0 1 to 3 0 MeV 1 2 7 Measurement range of beta radiation flux density 10 to 10 cm min 1 2 8 Limits of the permissible basic relative measurement error of beta radiation flux A OOO A AE A O A RONA A EB 20 200 P where P is a dimensionless unit numerically equal to measured values of measured beta radiation flux density in cm min 1 2 9 Warm up time of the dosimeter a I min 1 2 10 Continuous operation of the dosimeter when powered by two AA size alkaline batteries provided the illumination of the display is switched off and the level of background radiation is normal CS a R E AT A RE AE NEE A eee 400 hours 1 2 11 Instability of readings within 6 hours of continuous operation 10 1 2 12 Dosimeter is powe
5. MODE buttons to select the required value Use START button to confirm or H button for cancel the entered value turn the dosimeter off Turn the dosimeter on make sure that required value is set see symbol in the message line 2 4 3 Correction of adjusting coefficients Adjusting coefficients are set by manufacturer and can be changed only during repair or calibration in the engineering mode 2 4 3 1 Alternative assignment of controls Alternative assignment of controls in the engineering mode is presented in the Table 2 4 Table 2 4 Function name of buttons Function name of buttons in working mode in engineering mode ee ee a MODE T ys START ENTER 2 4 3 2 For review of current working coefficients turn on the dosimeter while pressing the H button and holding it pressed read data on the display see Table 2 5 Table 2 5 ALKALINE Battery type used for calculation of residual capacity K 104 ADC correction coefficient K 0 00e 00 Correction coefficient for the detector s background 2 4 3 3 Correction of workout coefficients For correction of workout coefficients switch to the engineering mode for that turn the dosimeter on holding the following buttons pressed simultaneously H MODE and START FVKM 412152 005RE 12 1 For correction of coefficients enter the access code H H MODE a SELECT POSITION select req
6. position p measure the background in accordance with 2 3 3 by pressing the MODE button make sure that display windows AEDR DOSE are switched over on the indicator transfer the shutter control lever to the extreme lower position y and make sure that the measurement has started and the beta radiation flux density B cm xmin is being indicated 2 3 3 Background measurement 2 3 3 1 After turn on the dosimeter starts simultaneous measurement of the background in the infinite acquisition mode and AEDR measurement in autorestart mode gt The background measurement continues until the statistical uncertainty 10 is reached In the process of background measurement display windows AEDR and DOSE are accessible FVKM 412152 005RE 8 If the user opens the shutter before the measurement is finished the messages BACKGROUND IS NOT DEFINED measurement of B will be possible not earlier than in time before the measurement is finished seconds and the count rate measurement y B will start When the background measurement is finished ass the display windows are available When the shutter is opened by means of a lever the display window B em xmin is activated automatically and measurement of the beta radiation flux density starts To start a new measurement press the START button or close and open the shutter 2 3 3 2 If during the dosimeter turn on th
7. during precipitation place the dosimeter in a plastic bag 2 2 Preparation of the product for use 2 2 1 Unpack the dosimeter perform external examination to determine the absence of mechanical damages 2 2 2 Open the lid of the battery compartment and make sure that two batteries are in place contacts are reliable and no salt is present on the elements as a result of a long term storage of the dosimeter If salt is present extract batteries out of the battery compartment and replace them Install batteries in place according to polarity and close the lid of the battery compartment FVKM 412152 005RE 1 2 3 Use of the product 2 3 1 Turning on off To turn the dosimeter on press and hold the ON OFF button within 2 3 seconds The information mentioned below indicates that the dosimeter is switched on trademark of the manufacturer type of the batteries used software version MKS 15D F i SNEGIR Figure 2 1 Information on the dosimeter indicator at its turn on To turn the dosimeter off press and hold the ON OFF switch for at least 6 s until the following message is displayed on the recording indicator DEVICE IS SWITCHED OFF RELEASE THE BUTTON 2 3 2 Operability test Before starting to use dosimeter familiarize yourself with location and purpose of the control buttons in accordance with 1 3 1 1 turn the dosimeter on in accordance with 2 3 1 when the shutter is in extreme upper
8. operational documentation absence of defects which could affect the dosimeter s operation 4 5 2 Testing Testing of the dosimeter is carried out in accordance with 2 3 2 The dosimeter is operable if the measured background value is indicated on the corresponding indicator windows 4 5 3 Determination of basic relative measurement error of AEDR of photon radiation Determine the basic relative measurement error of AEDR of photon radiation at values of gamma radiation of 10 and 1500 uSv h in the autorestart mode gt gt symbol on the display Perform the calibration as follows 1 Place the dosimeter on calibration installation with rear panel towards the source the center of dosimeter s sensitive area upper rear part of the dosimeter at depth 10 mm shall be located at the central axis of the gamma radiation beam at a distance from the source corresponding to reference AEDR value 2 turn the dosimeter on according to 2 3 1 3 expose dosimeter to radiation and take readings in the display window AEDR when the statistical error of less than 5 4 perform at least three measurements for each test point 3 for each test point calculate the arithmetic mean of the measurements H uSv h by the following formula Mk s H H iz 4 1 meanj gt we 6 for each test point calculate the basic relative error in per cent by the following formula Pa H 5 8 100 5c 4 2
9. rays of sunlight 7 TRANSPORTATION 7 1 Dosimeters in the original manufacturer s package can be transported by all means of transport at any distance transportation by railway shall be carried out in clean boxcars when transported by air the boxes with dosimeters shall be placed in air tight heated compartment when transported by water and sea transport the boxes with dosimeters shall be placed in the hold 7 2 Arrangement and fastening of the boxes on transport means shall provide their steady position en route absence of displacement and striking each other 7 3 The requirements of the inscriptions on the transport packing shall be observed during loading and unloading 7 4 Transportation conditions are as follows gt MERMD CLAUS sehr cease ADR bik ete tease os Onin cecum teks recs from minus 25 to 50 C gt C1 a GRA O AEP a Ate tea NE A OE ER TM MI up to 95 at 35 C impacts with peak shock acceleration 98 m s duration of impact 16 ms number of shocks from each direction not less than 1000 8 DISPOSAL 8 1 No special requirements for disposal of the dosimeter are made FVKM 412152 005RE 17
10. Igu t z 3 100 RO zi where H is the arithmetic mean of three AED measurements in the test point uSv H t is the reference value of AED Sv t is the duration of exposure hours The results of calibration are considered satisfactory if the relative measurement error of AED of photon radiation does not exceed the limits stated in the section 1 2 3 4 5 5 Determination of basic relative measurement error of beta radiation flux density Determine the basic relative measurement error of beta radiation flux density at values of flux density 400 and 1000 cm min Perform calibration as follows 1 turn the dosimeter on according to 2 3 1 2 perform the background measurement with the detector window closed by the shutter 3 open the shutter pushing the control lever to the lower extreme position y 4 place the dosimeter with an open detector window above the surface of the source for 2 mm so that all the work surface of the detector is located over the active surface of the source 5 take readings from the display window B cm xmin on the indicator 6 perform at least five measurements of beta radiation flux density for each test point calculate the arithmetic mean value for each test point 7 for each test point calculate the basic relative error of beta radiation flux density Qin per cent by the following formula a P m Fe 100 4 3 ref where P is the arithmetic mean value of beta radiation flux
11. K 003a Scientific Production Company Doza DOSE RATE METER RADIOMETER MKS 15D Snegir User manual FVKM 412152 005RE Content I Description and operation of the product 3 Pd et OGUCE AU MIC EIO NAMI V a O O ASA EE 3 12 TSC ITI Cal NALA ED IS TICS na ine A dre rn sli a a oje en nee 3 I Deston ANG Operat ai rana ne k EN k AAA SE N 5 A Marko and SCAMS an aaa O R e bene O aje AE Z Spd LC SEA 7 2 AMIENOCO USE A ONE AA RE OE NE O Z 2 1 Operational Imitations aii opa be A a ae a jana 7 22 Preparation Of NE PROJUCCIOF USEC ani O WEGO Z A AA PASA 7 ON SSO Ee ej AO EA PE EO EVRE PENE IE kia 8 TAAAC USNC a A E E E re nad wae VERI nena a Was RIM MARIN 12 IMam enano a AA OP AE A 13 AEC Ee T z eee E RE EAA 13 IZo DEECAUUO S ZE EN A E r 13 Jo MAN NACE TOMI aa a be EE A EEA 13 AC ADE AMON TOULING pie Pena tuk PE SN anes iN AE 14 Ai Creme ral regue MEBLI S auars EO A AR ARE WORA T sti 14 4 2 Preliminary ALAN OCMC aero TOW z OE 14 DALE Die C A ONS eryri ran EOE AO O polac 15 ZE CONA O Za ee di ECO PTA a mae ea ARKO aa 15 WD EOC CRG ise a a NAA AE Ra aa dk ri eee aan 15 DS ROI SEP IS ee AE O ROSE A A WAG 17 OOO AG Ca RA ee EAC a Ne SKO 17 V LAN POTA O wa ona CL o ia O O O Roy 17 DISDOSA Lenin OOO OOO NOK AE 17 FVKM 412152 005RE 2 This User Manual contains information on design principle of operation characteristics of the product and instructions essential for correct and
12. N appears release the button 2 use the je and MODE buttons to set the required position AERD photon radiation threshold Ly beta flux density threshold LB 3 press the START button on the upper part of the indicator the EDITION message appears release the button 4 set the required value using the x and MODE buttons 5 confirm the set value pressing the START button or cancel it pressing the H button at that the dosimeter switches over to the position selection mode 6 to exit the mode press the M button and turn off the dosimeter pressing the on off button 2 3 9 Turning audible signal on off 2 3 9 1 When the dosimeter is turned on sound is turned on automatically it 1s indicated as the i symbol at the top of the display window To turn the sound off press the H button The symbol of crossed speaker xx will show that the sound is turned off To turn the sound on press the H button again FVKM 412152 005RE 10 2 3 9 2 When the value of the set control threshold is reached sound signal turns on It is turned off in the following cases ifthe value measured within 8 seconds doesn t exceed the set threshold atthe shutter being opened closed for 20 seconds if any button is pressed at that the button function is being operated after 20 seconds the sound signal will resume 2 3 10 Turning the display illumination on off To turn the display illumination on
13. audible signal is not generated 1 3 4 Statistical uncertainty of the indicated results is calculated on the basis of the established confidence probability Conventional symbols of the confidence probability reliability displayed at the indicator are as follows completely shaded diamond corresponds 95 unpainted diamond corresponds 80 dotted diamond corresponds 60 1 4 Marking and sealing 1 4 1 The following information is presented at the dosimeter s case trademark and or name of the manufacturer reference designation of the dosimeter works number of a dosimeter according to the manufacturer s system of numeration degree of ingress protection provided by casings 1 4 2 The dosimeter is sealed in accordance with the design documentation 1 5 Packing 1 5 1 The dosimeter is packed into a carton which ensures protection against ingress of atmospheric precipitations and aerosols splashes of water dust sand solar ultra violet radiation and also limits the ingress of water vapour and gases 2 INTENDED USE 2 1 Operational limitations 2 1 Dosimeter retains operability under conditions stated in section 1 2 ATTENTION UNDER TEMPERATURES BELOW 0 C THE DISPLAY RESPONSE IS SLOW THIS IS NOT AN EVIDENCE OF THE DOSIMETER S MALFUNCTION 2 2 It is forbidden to use of the dosimeter at electrical substations of medium 6 35 kV and high above 35 kV 2 3 When working in a dust environment or
14. city depend on the type of batteries and their correct installation indicated residual capacity is for reference only the dosimeter does not take any action if the potential drops below acceptable limit residual capacity is calculated on the basis of measured potential of two tandem batteries and thus readings may not correspond to reality due to the deep discharge or malfunction of one of the batteries FVKM 412152 005RE 1 2 4 Adjustment 2 4 1 Change of battery type To change the battery type turn on the dosimeter while holding the 9 button pressed a message SELECT THE TYPE OF BATTERY and currently used battery type will be shown on the display Use je and MODE buttons to select the desired type confirm selection by pressing START button in this mode after that the dosimeter will switch over to the working mode Use H button to exit the selection mode At that the dosimeter will switch over to the working mode and the previous type of batteries will remain unchanged 2 4 2 Change of the confidence probability value predetermined reliability To change the value of confidence probability switch over to the engineering mode For that turn the dosimeter on while holding the H MODE and START buttons pressed simultaneously A request for entering the access code will appear on the display The code is as follows START gt MODE gt MODE gt START gt START Use and
15. d main technical characteristics of the calibration tool 4 5 3 4 5 4 Calibration installation UPGD 2M D UPGD or equivalent range of reproduced AEDR from 5 10 to 5 10 Sv h 4 5 5 Set of sources 4SO range of reproduced beta radiation flux density from 10 to 10 em min Stopwatch with measurement range 1 to 3600 seconds Thermometer with measurement range 0 to 30 C and scale interval 0 1 C 4 5 3 4 5 4 4 5 5 Psychrometer with measurement range 20 to 90 error 6 4 5 3 4 5 4 4 5 5 Barometer with measurement range 60 to 120 kPa and scale interval 1 kPa Note It is allowed to use other tools and equipment with similar characteristics ensuring determination of metrological characteristics of dosimeters with required precision FVKM 412152 005RE 14 4 3 Safety precautions It is necessary to follow safety requirements described in section 3 2 and in documentation accompanying calibration tools and equipment 4 4 Conditions The following normal operating conditions shall be met during calibration I WOM Piet AVE sara o rte ae ORA DEO 20 5 C TEA VATE pundi sect aldo a Od Kadi da o doza from 30 to 80 qlMOSPDRENICPLESSUTE A car ARE O dE AC 86 0 to 106 7 kPa natural radiation background not more than 0 25 uSv h 4 5 Procedure 4 5 1 External examination Items to be checked during external examination proper completeness availability of
16. density cm min P is the value of beta radiation flux density reproduced by the reference source cm min re The result of calibration is considered satisfactory if none of the calculated relative measurement error of beta radiation flux density exceeds the limit stated in the section 1 2 8 FVKM 412152 005RE 16 5 ROUTINE REPAIRS 5 1 Possible problems and their solutions are shown in the Table 5 1 Table 5 1 Possible problems and their solutions Batteries are discharged Replace batteries Dosimeter won t No contact between batteries and terminals Restore contact between turned on of the battery compartment batteries and terminals Failure of one of batteries Replace a faulty battery 5 2 In case you can not solve the problem listed in the Table 5 1 or when a more complex problem occur send the dosimeter for repair to corresponding repair service or to the manufacturer 6 STORAGE 6 1 Prior to putting into operation dosimeter shall be stored in a heated warehouse with natural ventilation in manufacturer s package at ambient temperatures from 5 to 40 C and relative humidity up to 80 at 25 C unpacked at ambient temperatures from 10 to 35 C and relative humidity up to 80 dl am E 6 2 The storage location should be free of dust chemical vapours aggressive gases and other substances that may cause corrosion The storage location shall exclude exposure of dosimeters to the direct
17. e shutter is opened the message CLOSE THE SHIELD appears on the display After that the dosimeter will switch over to the sleep mode When the shutter is closed the dosimeter starts background measurement When the shutter is being closed and it is in a middle position the message MOVE THE SHUTTER TO THE EXTREME POSITION is displayed This message is warning and doesn t affect the dosimeter operation modes ATTENTION WITH THE SHUTTER IN A MIDDLE POSITION THE MEASUREMENTS ARE NOT PERFORMED 2 3 4 Measurement of AEDR of photon radiation Measurement of AEDR of photon radiation starts when the dosimeter turns on at the shutter closed and is carried out only in the gamma radiation measurement mode The dimension is Svxh or its submultiple units 2 3 5 Measurement of AED of photon radiation Measurement of AED of photon radiation starts when the dosimeter turns on at the shutter closed and is carried out only in the gamma radiation measurement mode The dimension is Sv or its submultiple units To view the values of measured AED select corresponding display window DOSE by pressing the MODE button 2 3 6 Measurement of the beta radiation flux density Prior to measurement of the beta radiation flux density perform measurement of the background gamma radiation according to 2 3 4 The most accurate results will be obtained if during the background gamma radiation measurement the dosimeter 1s located parallel to the surface
18. e the batteries each time before long term storage of the dosimeter To do this proceed as follows turn the dosimeter off remove the lid of the battery compartment take the batteries out of the battery compartment review the battery compartment check condition of terminals clean contamination in the battery compartment and remove oxide from terminals make sure there is no moist no spots of salts on the surface of batteries and no damage of insulation either install the lid of the battery compartment 3 3 3 Periodic maintenance Periodic maintenance consists of calibration of dosimeter 4 CALIBRATION ROUTINE 4 1 General reguirements 4 1 1 Calibration of a dosimeter is performed in accordance with the IEC 61453 2007 4 2 Preliminary arrangements 4 2 1 Operations performed during calibration are listed in Table 4 1 Table 4 1 List of calibration operations Determination of basic relative measurement error of AEDR of photon radiation Determination of basic relative measurement error of AED of photon radiation Determination of basic relative measurement error of beta radiation flux density 4 2 2 Primary and auxiliary tools and equipment necessary for calibration are presented in the Table 4 2 Table 4 2 Primary and auxiliary tools and equipment for calibration Name and type designation of primary or auxiliary calibration tool document Section that regulates technical requirements and or metrological an
19. isplay of measurement results at the indicator Data processing and control circuit is made on the basis of the microprocessor and used for control of operation modes of the dosimeter mathematical processing of pulse sequences from the detector for control of indicator and audible signals Anode voltage generator is used for generation of the anode voltage of 400 V required for the detector operation For power supply of the processing and control circuit two AA size batteries with total nominal voltage of 3 0 V are used 1 3 3 To reduce the dosimeter response time to the AEDR changes autorestart mode is used When an arithmetic mean value of samples from last measurements deviates from the general arithmetic mean by an amount that exceeds the error of the general arithmetic mean by predetermined value the start of new measurement is initiated FVKM 412152 005RE 6 Thus when the symbol gt gt is indicated on the display the automatic restart of AEDR measurement and beta radiation flux is enabled It is performed both when the acquired count rate measurement value exceeds the predetermined limits and when the START button is pressed Restart 1s accompanied by an audible signal In case of automatic restart the signal is generated regardless of the audible signal blocked permitted In the infinite acquisition mode symbol on the display restart can be performed only by pressing the START button In this case
20. move the shutter control lever to the extreme lower position until the background measurement is finished that is until F character appears in the outside left corner of the indicator The message BACKGROUND IS NOT DEFINED appears on the indicator the background measurement is not stopped After that the average count rate value exclusive of factors in s and the MONITORING message are displayed on the indicator In the headline of the window the y B symbol is indicated The measurement is resumed when the shutter is closed 2 3 8 Control threshold setting 2 3 8 1 Control threshold may be set only for AEDR photon radiation measurement and beta flux density measurement modes The control threshold is controlled 1 at the shutter closed the extreme upper position of the lever B for the AEDR photon radiation measurement mode 2 at the shutter opened the extreme lower position of the lever y for the beta flux density measurement mode 2 3 8 2 Values of the set control threshold during the measurement photon measurement AEDR from 0 01 uSv h to 9 99 Sv h beta radiation flux density 1 0 to 9 99 10 cm min the threshold values on default switched off 2 3 8 3 To set the control threshold values 1 press the START button at the dosimeter switched off and hold it to turn on the dosimeter on the upper part of the indicator the message SELECT POSITIO
21. red by two AA size alkaline batteries 1 2 13 Dosimeter is resistant to change in power supply voltage from 1 8 to 4 0 V FVKM 412152 005RE 3 1 2 14 Measured values of AEDR and AED of gamma radiation beta radiation flux densities and count rate at the combined measurement y B are by turn displayed on the digital LCD display hereinafter display with indication of signs of information compliance Measurement units in which the values are displayed JABDR ofphoton radiation tai nei been dd GO a bi bne Svxh ZASP OV POLO TA OM ae or ke EE AE OE o EJ A LEO EA SV beta radiation TuUL densi yeere cire A ke oa saan A AGA ORA O cm xmin count rate in the joint measurements y P radiation sl 1 2 15 Dosimeter beeps when gamma ray or beta particle hits the detector and when the given control threshold is reached 1 2 16 Dosimeter is resistant to short term with duration 5 minutes overloads of measured radiation with AEDR of gamma radiation up to 0 02 Sv h After exposure to overload the dosimeter maintains operability and basic relative measurement error within the limits stated m 1 2 3 1 2 8 1 2 17 Operating conditions peratme temperature TANS sereis erer voja ba ae R pena minus 20 to 50 C maximum value of relative humidity a 90 at 35 C lt qlMOSPKERIC PLCSSULC wa a seis eee ti AAA EOG O a ie beads Baws 84 0 to 106 7 kPa
22. sabled symbol o0 on the display and backwards when the button is pressed within more than 5 seconds START resets the current value of the measured value and starts the new measurement cycle 1 audible signal turns on gj or turns off mx beep accompanying the detected radiation 1 3 1 2 The following modes of operation are available with restart enabled symbol gt gt on the display or with restart disabled infinite acquisition symbol co on the display 1 3 1 3 The measurement results of different operation modes are shown on the display in the form of display windows for presentation of information current AEDR value in Sv h estimated error in per cent thereinafter AEDR window current AED value accumulated since turn on of the dosimeter or since the last restart of the current mode thereinafter DOSE window the value of beta radiation flux density in cm xmin at a continuous background account thereinafter B cm xmin window the average count rate for gamma and beta radiation in s thereafter y B window The display windows have the following structure upper part current operation mode with autorestart gt gt symbol or infinite acquisition co symbol measured radiation gamma y or beta B confidence probability or presence q or absence a X of sound residual capacity of batteries middle part the measured val
23. safe use of this product intended use maintenance servicing storage and transportation as well as information regarding the utilization of the product 1 DESCRIPTION AND OPERATION OF THE PRODUCT 1 1 Product functionality Dose rate meter radiometer MKS 15D Snegir heremafter dosimeter is intended for measurement of ambient equivalent dose H 10 hereinafter AED and ambient equivalent dose rate H 10 hereinafter AEDR of photon radiation and beta particle flux density as well as for estimation of count rate at the combined measurement of gamma and beta radiation hereinafter y p The dosimeter is used for radiation survey at industrial enterprises in ecological studies checking of radioactive contamination of bank notes in banks radiation measurements in housing premises buildings and structures and adjacent territories household appliances clothes garments soil surface of the homestead lands vehicles The dosimeter provides threshold excess alarm signals 1 2 Technical characteristics 1 2 1 Energy range of measured gamma radiation 0 05 to 3 0 MeV 1 2 2 Measurement range AEDR of gamma radiation ee 1 10 to 2 10 Sv h GABE OP gamma TAC AOM a EA Z ad p EE 1 10 to 10 Sv Note At AED level less than 1 10 Sv the dosimeter serves as indicator and its measurement error is not normalized 1 2 3 Limits of the permissible basic relative measurement error
24. to be measured and at a minimum distance from it After the background measurement is completed don t move the dosimeter and open the shutter by moving the lever to the extreme lower position y The measurement of the beta radiation flux density will start automatically The measured value on the display of the beta radiation flux density and statistical uncertainty of the measured value will be indicated in the display window B cm xmin The dimension of the measured value is cm xmin Each detected particle is accompanied by an audible signal if the sound is on according to 2 3 6 F 2 1 where n 1s the total count rate of beta and gamma radiation at the shutter opened n is the count rate of gamma radiation with the shutter closed n 1s the sensitivity of the open detector to beta radiation The dosimeter was calibrated by the manufacturer using the Sr Y source with the cutoff beta spectrum energy of 2284 keV FVKM 412152 005RE 9 When beta radiation flux density from other nuclides is measured the correction factor for dependence of the detector sensitivity on the beta radiation energy is required Correction factors for dependence of the detector sensitivity on the beta radiation energy for some beta radionuclides are presented in the Table 2 1 Table 2 1 vsem 2 3 7 Count rate alteration at the combined y P radiation measurement To measure the average beta and gamma radiation count rate
25. ue with indication of dimension and the estimated error of the value if provided bottom part information about the current process of the background value measurement the outside left symbol 1 countdown timer 8 6 4 2 period of dosimeter testing and background estimation 2 hourglass symbol re background measurement 3 F character the background is measured and the dosimeter is ready for beta radiation flux density measurement 4 if the control threshold is not set or not provided for the current mode the set value of control threshold is indicated as symbol 1 3 1 4 To choose the corresponding display window press briefly the MODE button Depending on the shutter position the display windows indicated in Table 1 1 are available FVKM 412152 005RE 5 Table 1 1 Display windows Shutter position Shutter is closed measurement of Shutter is opened measurement of beta background AEDR AED radiation flux density AEDR DOSE B emmin window window window Turns the illumination on for 15 seconds Pressing the button at the illumination on turns it off Switches between AEDR and AED display windows When the button is pressed for more than 5 seconds the dosimeter switches from autorestart mode gt 1 gt to infinite acquisition mode oo and backwards Resets AEDR ne Resets accumulated Resets current value of the beta particles current value and
26. uired position using and 1 buttons EDITION switch over to the edit mode by pressing the ENTER button enter required coefficient value using 1 buttons confirm the newly set value by pressing ENTER button or cancel it by ESC button turn the dosimeter off turn the dosimeter on by pressing H button make sure that all data are set correctly 2 For correction of the ADC correction coefficient enter the access code H START MODE MODE using 1 buttons enter the coefficient value for which the voltage indicated on the display corresponds to the voltage measured at the terminals of the power connector confirm the newly set value by pressing ENTER button or cancel it by ESC button turn the dosimeter off turn the dosimeter on by pressing I button make sure that data are set correctly 3 Setting of default coefficients enter the access code MODE MODE START N e after entering the access code the dosimeter will write to the EEPROM universal default set of coefficients presented in Table 2 5 3 MAINTENANCE 3 1 General notes Maintenance is performed with the purpose of ensuring reliable long term operation of dosimeters No special qualification or workplace arrangement is required 3 2 Safety precautions 3 2 1 Before beginning to work with dosimeter familiarize
27. water solution 2 5 citric acid solution in rectified alcohol 1 2 25 Weight of the dosimeter including batteries 0 35 kg 1 2 26 Overall dimensions of the dosimeter 124x72x35 mm 22 7 METU METO AMIE a ee A ee il enka ea not less than 6000 hours le 28 Mean IE E in R O A O CA ZR ee aa ee pele de not less than 6 years FVKM 412152 005RE 4 1 3 Design and operation 1 3 1 All the units of the dosimeter are installed in a compact plastic house The at the top of the upper lid there is the display to the left and to the right of the display the following control buttons are located the shutter control lever and the battery compartment are situated lower At the bottom of the cover there is a detector window which is closed by a shutter for beta radiation shielding during the photon and background AEDR radiation hereinafter background the shutter 1s driven by a lever The power switch is located in the upper part of the dosimeter s side surface 1 3 1 1 Control buttons of the dosimeter are as follows gt R illumination press the button to turn on the illumination for 15 seconds press the button at the illumination on to turn it off MODE allows selecting windows of the display and switches the dosimeter from mode when automatic restart is enabled symbol gt gt on the display into a mode when automatic restart is di
28. without changing the operation mode press the button for a short time The illumination will turned off automatically in 15 seconds If within this period the e button is pressed again the illumination will turn off 2 3 11 Battery replacement The dosimeter s power supply voltage is in the range 4 to 1 8 V The dosimeter can operate when the voltage drops down to 0 9 V but take into account that during startup the dosimeter consumes current of up to 50 mA and thus fully discharged batteries can not provide the required starting voltage The foregoing also applies to the case when one battery is deeply discharged and the other battery is fully operable In the upper part of the display window the residual capacity of batteries is indicated according to the Table 2 2 Table 2 2 Residual capacity of batteries Capacity of More than GG a EE ata Less than batteries 90 90 770 70 50 50 30 30 10 10 When gt lt symbol appears on the display batteries should be replaced To replace batteries open the battery compartment and insert two alkaline batteries of AA size in accordance with polarity The following batteries can be used in the dosimeter see Table 2 3 Table 2 3 Types of batteries be used for power supply Typical residual capacity voltage Typical m Type of for two batteries capacity Ah specific attribute battery Rioag 10 for GP batteries uh Please note potential and residual capa
29. yourself with this User Manual 3 2 2 During all operations with dosimeter follow occupational and radiation safety requirements of current safety instructions in the company enterprise 3 2 3 Intended use of the dosimeter does not present danger for the user and environment 3 2 4 The dosimeter does not contain external parts on which dangerous voltage could be present To protect the user from accidental touching of the conductive parts the dosimeter is equipped with protective case ATTENTION DO NOT OPEN OR RECHARGE GALVANIC BATTERIES 3 3 Maintenance routine 3 3 1 Maintenance is divided into routine and periodic 3 3 2 Routine maintenance 3 3 2 1 Routine maintenance is carried out during regular operation it includes inspections of a dosimeter for timely detection and elimination of factors which can compromise their operability and removing batteries before long term storage 3 3 2 2 The following main types and periodicity of routine maintenance are recommended R GG JETS OSO OPORY every month cleaning of external surfaces decontamination every month 3 3 2 3 Cleaning of external surfaces of a dosimeter is performed in accordance with work schedule at the company facility with solutions indicated m 1 2 25 After washing surfaces using clothes moisten with distilled water dry them with filter paper FVKM 412152 005RE 13 Dry cleaning can be performed with any periodicity 3 3 2 2 Remov
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