User Manual
Contents
1. 1 2 16 Dosimeter is stable against RF radiation in the band 80 to 1000 MHz with field strength 3 V m in compliance with IEC 61000 4 3 2006 electrostatic discharges with voltage 8 kV contact discharge and air discharge in compliance with IEC 61000 4 2 95 1 2 17 By its protection against electric shock dosimeter complies with the IEC 61010 1 2001 1 2 18 Dosimeter withstands the exposure of decontamination solutions trisodium phosphate or sodium hexametaphosphate any synthetic detergents water solutions 10 20 g l 5 citric acid solution in rectified alcohol 1 2 19 Weight of the dosimeter including batteries eese 0 25 kg 1 2 20 Overall dimensions of the dosimeter lengthxwidthxheight 74x29x122 mm 1 2 21 Mean time to failure ee toro etr Ies not less than 8000 hours 1 222 Mean life tierno a ida a a esee ME not less than 7 years 1 3 Design and operation 1 3 1 All modules of the dosimeter are placed in a compact plastic case A liquid crystal display hereinafter LCD is provided in the upper part of the dosimeter s front panel controls are located in the middle part 1 3 2 The principle of operation of the dosimeter is based on counting of pulses from GM counter The built in converter provides high voltage 400 V for the counter Data processing is carried out by microprocessor obtained measurement result is displayed on the LCD 1 4 Marking and sealing 1 4 1 The following info2. Batteries are discharged or absent No contact between batteries f Replace batteries After the dosimeter is turned on p random symbols appear on the LCD Danese dIo Harget 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 96 at 25 C 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 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 open motor transport boxes shall be covered by the water proof material 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 FVKM 412113 026RE 10 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 requirement
3. operations of a dosimeter shall be familiar with rules for working with equipment with voltages up to 1000 V and be especially cautious during repair works 3 3 Maintenance routine 3 3 1 Maintenance is divided into routine and periodic 3 3 2 Routine maintenance 3 3 2 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 safety and replacement of batteries 3 3 2 2 The following main types and periodicity of routine maintenance are recommended s yis alanspeetiofi ofc ende venga veu ds entre werent reeves every month cleaning of external surfaces decontamination ssuueuusue every month 3 3 2 3 Decontamination of a dosimeter is performed in accordance with work schedule at the company facility but at least once a year Decontamination procedure decontaminate external surfaces of dosimeters using clothes moisten with solutions 1 or 2 of the 1 2 18 wash surfaces using clothes moisten with distilled water then dry with filter paper Dry cleaning can be performed with any periodicity 3 3 3 Periodic maintenance Periodic maintenance consists of calibration of dosimeter in accordance with section 4 FVKM 412113 026RE 7 4 CALIBRATION ROUTINE 4 1 General requirements 4 1 1 Calibration of a dosimeter is performed in accordance with the IEC 61453 2007 4 2 Prelimina
4. the START button 2 place the dosimeter on calibration installation with front panel towards the source and the center of dosimeter s sensitive area located at the central axis of the gamma radiation beam at a distance from the source corresponding to reference AEDR value 900 pSv h the detector s center is located 20 mm deep below the center of the circle at the dosimeter s front panel 3 simultaneously start exposing the dosimeter to radiation and start the stopwatch 4 stop exposure after 360 seconds and take readings in uSv from the LCD 5 perform three measurements for this test point FVKM 412113 026RE 9 6 calculate relative measurement error of AED of gamma radiation 6 in per cent by the following formula 2 Sq uS RE 82 4 2 ref where H ref t is the reference calculated value of AED uSv Hon is the arithmetic mean value of three measurement results of AED for the test point uSv Scar 1s the uncertainty of the calibration installation from the calibration certificate t is the duration of exposure hours The result of calibration is considered satisfactory if the relative measurement error of AED of gamma radiation does not exceed the limit stated in the section 1 2 3 S ROUTINE REPAIRS 5 Possible problems and their solutions are shown in the Table 5 1 Table 5 1 Possible problems and their solutions Problem Possible cause Solution Dosimeter won t turned on
5. E ada RHE 1 to 2 10 uSv 1 2 3 Limits of the permissible basic relative measurement error of AEDR and AED of g mma radiation oere odecoe Y pode ko DOSE EU Ee X dte codes neta beue dli Fe ERENS EGUNE 15 2 5 H 9 where H is a dimensionless unit numerically equal to measured values of measured AEDR or AED in uSv h and Sv accordingly 1 2 4 Energy dependence relative to Cs 0 662 MeV sssee 25 1 2 3 A isotropy of dosimeter sersa EE E E Een E a TUR e EUR ACER SEE dta dil 30 for energies 0 662 and 1 25 MeV and with incidence angle changing from 0 to 180 relative to the direction used during dosimeter calibration in vertical and horizontal planes except the angle 90 in horizontal plane for which the anisotropy of sensitivity is not more than minus 45 96 for energies 0 06 MeV with angle changing from 0 to 45 relative to the direction used during dosimeter calibration in vertical and horizontal planes 1 2 6 Warm up time of the dosimeter iine p ie nire ESTE n Rene xa not more than 5 s 1 2 7 Continuous operation with one set of batteries seen 200 hours 1 2 8 Instability of readings during 8 hours of continuous operation relative to average value of readings Tor this period 07 time i i dee Yu Cet xor ers ru piv EE COMER RH UR QU TERRAE 3 96 1 2 9 Interval of measurement of AEDB 4 correr eta sr E Eee eR as ao E NS RARE not limited Note In the mode of AEDR measurement the precisi
6. N Oo 3a Scientific Production Company Doza DOSIMETER DKG 07D DROZD User manual FVKM 412113 026RE Content 1 Description and operation of the product esses 3 1 1 Product functionality este ete RE ENT o ERE exa nares 3 1 2 Technical characteristics idees uut dd cule o vest diee 3 1 3 Design and operation seo ees ro NOSE ORE Ix ttu 4 1 4 Marking and sealing ae a e ete CBE E RE 4 1 5 Packing uus tasa deeasao ts dei giat rtu a bot eid Rr b Er ere Eia 4 Pe Intended 388 5 gei archer Saad Gar cioe Cope M FERE A Mie aly vam EE DE 5 2 1 Operational limitations 2 ooo oe eere koe ete tat ew ER 5 2 2 Preparation of the product for use sssseseessssse 5 23 Useofa producta partite t RN EU E ARN UR ES EE 5 2 JL Adj stment ve ren a a a In as dedere adaa 6 5 Mamtenaee osos catus a E EE A EA 7 Sil General not s soies ARR EORR a 7 3 2 Safety Brecaut omis oiia ir uds ou yc M na is av ari allure bir elo 7 3 3 Maintenance routine oce ES vehi Mex oto dou veh Diete debate n uns 7 4 Calibration routine S oc ccnedcanaecasapeapanness tase nde drag ein eanenemnutokead edoeunnans 8 4 1 General reg itementS niacsvswnnczacereswnewtiancamesnlcutgmauaedigde 2S 4 2 Preliminary arrangements Jie e ly ree ne e eria 8 2 3 Safety precautions 22s suc p coven dece o pa oia et of 8 A A Conditions usse ser oto vro elite Pat diesen tese eae 8 4 5 Procedure moisir irona OR e o d e bt C eae Re aay hia 9 5 Routine repa S esere g dor set t
7. ed after pressing the START button Taking readings from the LCD shall be performed after the moment when statistical uncertainty indicated in the lower line has reached the required value FVKM 412113 026RE 5 2 3 4 3 Measurement interval of AEDR is not limited In the course of AEDR measurement continuous precision of readings is continuously improved with the increasing of measurement time at that decreasing value of statistical uncertainty is shown on the LCD ATTENTION The dosimeter indicates the mean value of AEDR relevant to the total measurement time Therefore if the AEDR value changes but the restart of measurement is not initiated the new value of AEDR is shown only after a long delay 2 3 4 4 Automatic restart of measurement of AEDR After the measured AEDR changes to the degree exceeding the statistical spread the dosimeter restarts measurement of AEDR without intervention of operator The restart is accompanied by short audible signal ATTENTION Such automatic restarts are possible from time to time even when the radiation field is not changed This is not an evidence of the dosimeter failure and is explained by statistical properties of the measured value 2 3 5 Measurement of AED The following information is shown on the LCD during measurement of AED 1 in the upper line the word DOSE 2 in the lower line measured value of AED in Sv with the prefix before this measurement unit 2 Wik ccc limi s DE ue
8. erence AEDR value 10 uSv h the detector s center is located 20 mm deep below the center of the circle at the dosimeter s front panel 2 turn the dosimeter on in the measurement mode and press the START button 3 expose dosimeter to radiation and measure AEDR taking readings from the LCD with statistical uncertainty is less than 5 96 4 perform at least three 1 3 measurements for this test point 5 perform operations described in 1 4 for the second level of AEDR equal to 900 uSv hr 6 For each test point j calculate the basic relative error of AEDR D in percents by the following formula Hs H s i 2 8 711 5 75 100 8e 4 1 ref where is the value of AEDR reproduced by the calibration installation UPGD 2M D uSv h J H is the arithmetic mean value of AEDR of gamma radiation calculated using three measurement results for each of test points uSv h Scar Is the uncertainty of the calibration installation from the calibration certificate The result of calibration is considered satisfactory if the basic relative measurement error does not exceed corresponding limit stated in the section 1 2 3 4 5 4 Determination of basic relative measurement error of AED of gamma radiation Determination of the basic relative measurement error of AED shall be performed with one value of AED equal to 90 uSv Perform calibration as follows 1 turn the dosimeter on in the AED measurement mode and press
9. eta tutors tte ga biete ETE RR EEEO na 10 wp cb ITA E A A EN A E PE 10 T JTADSDOTLIOT r a desit a nitus a a a ee ea A 10 S Disposa lesena E E E O E E es ted tus E 11 FVKM 412113 026RE 2 This User Manual contains information on design principle of operation characteristics of the product and instructions essential for correct and 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 Dosimeter DKG 07D Drozd FVKM 412113 026 hereinafter dosimeter is intended for measurement of ambient equivalent dose rate H 10 of gamma radiation hereinafter AEDR ambient equivalent dose H 10 of gamma radiation hereinafter AED The dosimeter can be used at nuclear plants and facilities at radiochemistry plants in industries where radiation sources are used at special and custom control stations and by ecological services and sanitary inspections The dosimeter can also be used by persons from population for individual monitoring of radiation environment 1 2 Technical characteristics 1 2 1 Energy range of measured gamma radiation esce 0 05 to 3 0 MeV 1 2 2 Measurement range AEDR obsamima radiation 3o eer cvia Seca t eve hen cies tase enema et 1 10 to 3 10 pSv h xblyoteaminiaradiatioti suus dere deett oq ui rr pA re PPRPdQ D
10. ff switch and observe the following messages on the LCD inthe upper line uere rico c Xx o te cons 0 00 pSv h inthe lower me eere ee ect TATION 2 3 1 2 After 2 3 seconds in the upper line the value of AEDR will appear and in the lower line the statistical uncertainty in per cents Presence of messages mentioned in 2 3 1 1 for more than 10 seconds indicates that the dosimeter is inoperable 2 3 1 3 To turn the dosimeter off press the power on off switch 2 3 2 Selection of measurement mode Dosimeter simultaneously runs in two modes measurement of AEDR measurement of AED Current value of one measurand is shown on the LCD To view the value of another measurand press the MODE button 2 3 3 Start of measurement Start of measurement in any mode is performed by pressing the START button This will initiate the measurement process of the measurand AEDR or AED which is indicated when the button is pressed while the process of measurement of another measurand carried out simultaneously will be continued 2 3 4 Measurement of AEDR 2 3 4 1 The following information is shown on the LCD during measurement of AEDR 1 in the upper line measured value of AEDR in Svh with the prefix before the measurement unit E T D PaeSosdud MEUS micro 10 E CORR E POR ELSE milli 107 2 in the lower line statistical uncertainty of measurement in per cent 2 3 4 2 Measurement of AEDR in each new point is start
11. k message 2 4 3 Adjustment of the conversion factor Press the SOUND button once again and observe on the LCD K in the upper line and the value of conversion factor in the lower line which is used to obtain the measurement result in Sv h from count rate in cps FVKM 412113 026RE 6 Press the START increment or MODE decrement button for correction of the conversion factor so that to obtain required readings reference value Holding this button pressed allows fast selection of required setting Next pressing on the SOUND button stores the entered value into memory This is acknowledged by K ok message 2 4 4 Return to the normal mode Dead time and conversion factor which were corrected but were not stored in memory remain unchanged To return to the normal mode of operation turn the dosimeter off and after at least 10 seconds on again 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 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 DANGEROUS HIGH VOLTAGE is generated in the dosimeter A person performing service
12. on of readings is continuously improved in the course measurement Simultaneously the decreasing value of statistical uncertainty is shown on the LCD that allows to regard the measurement result as final one when the desired precision is reached 1 2 TO Power s pply YORaBE sesenta eS RB RR A ROSE v dla teur 2 0 to 3 2 V 1 2 11 Power supply of the dosimeter is carried out from two batteries of AA type 1 5 V each with total voltage not more than 3 2 V 1 2 12 Operating conditions Operating temperature range cse et oct ede Co ea waded ved Nui alg minus 20 to 50 C maximum limit of relative humidity sse 90 at 25 C s atmospheric pressUte sessen i eot E Od cones CO FCU D SB 84 0 to 106 7 kPa FVKM 412113 026RE 3 1 2 13 Limits of complementary measurement error due to deviation of the ambient air temperature from its normal value per 10 C 5 90 increased relative humidity eas pre cot Uo Esa Io sxEe e sam Sus 10 96 change or the power supply voltage cech uc E CHE et Nae e deser nu tare 5 1 2 14 Degree of protection provided by casings against ingress of solid items and water accordimigto the IEG 929 89 seats ceva a A A a pe EE dae a uf IP40 1 2 15 Dosimeter is stable against short with duration 5 minutes overloads with value of AEDR of gamma radiation 0 1 Sv h After overload the dosimeter operable and maintains basic relative measurement error within normal range
13. quired precision 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 gt cdir teitiDetatul e s Leo eoases posture peso seid doatal re dpeeadud bed qu bb pecore presens 20 5 C delative air h midity s dieere ee a Ro a EEA von E re kinases from 30 to 80 96 atmospheric DEGSSUEe ovest eco POR RC n ERR UE qa MR HERR Mies 86 0 to 106 7 kPa natural radiation background 00 cccce cece eee e nee eeeeeneees not more than 0 2 uSv h FVKM 412113 026RE 8 4 5 Procedure 4 5 1 External examination Items to be checked during external examination proper completeness availability of 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 4 5 3 Determination of basic relative measurement error of AEDR of gamma radiation Determine the basic relative measurement error at levels of AEDR of gamma radiation 10 and 900 uSv hr Perform calibration as follows 1 place the dosimeter on calibration installation with front panel towards the source and the center of dosimeter s sensitive area located at the central axis of the gamma radiation beam at a distance from the source corresponding to ref
14. r decontamination shall undergo technical inspection If the technical condition of a dosimeter is satisfactory an extended operation term of the product shall be determined FVKM 412113 026RE 11
15. ra d pud pico 107 By Nose rude LI SEE A CES nano 10 E o a deus seueoyret here rer re micro 10 ES ean LR milli 10 2 3 6 Turning on the LCD illumination The user can illuminate the dosimeter s LCD by pressing and holding the LIGHT button 2 3 7 Turning the audible signal on off Detection of gamma photon is accompanied by clicks To turn this audible signal on off press the SOUND button 2 4 Adjustment Only persons who are authorized for performing calibration are also authorized to do adjustment 2 4 1 Entering adjustment mode To enter the adjustment mode turn the dosimeter on while previously pressing and holding both buttons SOUND and MODE After the dosimeter is turned on release buttons SOUND and MODE at that the LCD will show nothing 2 4 2 Adjustment of the dead time Press the SOUND button and observe on the LCD T in the upper line and the value of dead time in the lower line in seconds Press the START increment or MODE decrement button for correction of the dead time so that to obtain required readings reference value Increasing the dead time will result in increasing of readings and vice versa This adjustment is effective at AEDR more than 200 uSv h Holding this button pressed allows fast selection of required setting Next pressing on the SOUND button stores the entered value into memory This is acknowledged by T o
16. rmation is presented at the dosimeter s case trademark and name of the manufacturer supplier reference designation of the dosimeter works number of a dosimeter according to the manufacturer s system of numeration degree of ingress protection against solid items and water 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 FVKM 412113 026RE 4 2 INTENDED USE 2 1 Operational limitations 2 1 1 Dosimeter retains operability under conditions stated in sect 1 2 2 1 2 Avoid dropping of a dosimeter protect it from shocks and exposure to water 2 2 Preparation of the product for use 2 2 Dosimeter is ready for use when batteries are inserted into the battery compartment In case batteries are not inserted slide the cover of the battery compartment insert batteries observe the polarity and return the cover in its place 2 2 2 When the power supply voltage falls below 2 2 V a message REPLACE BATTERIES will appear on the LCD 2 2 3 Turning on off is performed by pressing the switch located on the upper end of the dosimeter 2 3 Use of product 2 3 1 Turning on off 2 3 1 1 Turn on the dosimeter by pressing the power on o
17. ry arrangements 4 2 Operations performed during calibration are listed in the Table 4 1 Table 4 1 List of calibration operations Operation Section External examination 4 5 1 2 Testing 4 5 2 3 Determination of basic relative measurement error of AEDR of gamma 453 radiation ps 4 Determination of basic relative measurement error of AED of gamma 454 radiation 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 that regulates technical requirements and or metrological and main technical characteristics of the calibration tool 4 5 3 4 5 4 Calibration installation UPGD 2M D or equivalent with 7Cg source with Cs source range of reproduced AEDR from 1 10 to 5 10 Sv h with uncertainty not more than 5 96 4 5 3 4 5 4 Stopwatch with measurement range 1 to 3600 seconds 4 5 3 4 5 4 Thermometer with measurement range 0 to 30 C and scale interval 0 1 C 4 5 3 4 5 4 Psychrometer with measurement range 20 to 90 96 error 6 4 5 3 4 5 4 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 re
18. s of the inscriptions on the transport packing shall be observed during loading and unloading 7 4 Transportation conditions are as follows Sue THIDO LAUR aereo rosse Roda a capacserdegeonousm aude nan sane a ro UA renee from minus 50 to 50 C JONNY screen sancarsheddasauaeasareenaetackstauater aaa aS up to 98 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 On full expiry of the dosimeter s service life and also prior to its dispatching for repair or calibration it shall be inspected for possible radioactive contamination of its surfaces Criteria for decision making on decontamination and further use shall comply with obligatory requirements of national standards 8 2 Decontamination shall be attempted in cases when the contamination of dosimeter s surfaces including surfaces accessible during repair can be reduced below allowable limits In case the radioactive contamination exceeds allowable limits requirements set forth for the radioactive wastes become applicable to the detectors 8 3 Dosimeter accepted for operation after decontamination shall be repaired or replaced in case of failure Dosimeter not suitable for operation with radioactive contamination levels below permissible limits should be transferred to a special site for disposal of industrial wastes 8 4 Dosimeter with expired lifetime accepted for use afte
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