Model A12 Exradin Farmer-type Chamber User Manual
Contents
1. zaz L H 4 4mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material 0 056 cm 60 R nC 4 1 mm from tip of chamber 1 0 mm 6 25 mm 1 1 mm A1SL Shonka Air Equiv plastic C552 Model 2 spokas Chamber A2 REF 92718 P2 REF 92720 T2 REF 92721 Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material 0 5 cm 6 R nC 7 0 mm from tip of chamber 4 6 mm 11 5 mm 1 0 mm A2 Shonka Air Equiv plastic C552 P2 Polystyrene Equiv plastic D400 T2 Shonka Tissue Equiv plastic A150 Model A12 Farmer Type Chamber A12 REF 92700 21 6 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material Included Co Buildup Cap 0 65 cm 5 R nC 12 9 mm from tip of chamber 1 0mm 7 1mm 0 5 mm A12 Shonka Air Equiv plastic C552 Wall thickness of 2 8 mm constructed of C552 10 Model A12S 0 25 cc Farmer Type Chamber A12S REF 92725 47 42. EXRADIN ION CHAMBERS Thimble lonization Chambers A STANDARDIMAGING lt User Manual 2 www STANDARDIMAGING lt S com EXRADINION CHAMBERS Thimble lonization Chambers STANDARD IMAGING INC TEL 800 261 4446 7601 Murphy Drive TEL 608 831 0025 Middleton WI 53562 2532 FAX 608 831 2202 Jul 2006 2006 Standard Imaging Inc DOC 80322 14 General Precautions Warnings and Cautions alert users to dangerous con ditions that can occur if instructions in the manual are not obeyed Warnings are conditions that can cause injury to the operator while Cautions can cause dam age to the equipment WARNING Electrical shock hazard when connected to 300 V bias supply WARNING Exradin Ion Chambers are intended for quality assurance and calibration measurements They are not intended to be connected to a patient for real time dosimetry measurements N CAUTION Proper use of this device depends on careful reading of all instructions and labels A CAUTION Do not drop mishandle or disassemble unit since it may result in a change of calibration fac tor or damage to thin walled Thimble tip Refer all servicing to qualified individuals N CAUTION Do not sharply bend triax cable Damage to the cable may result in high leakage currents CAUTION Connector end of ionization chamber should not be submerged This manual applies to the following thimble chamber models Model REF A1 92705 T1
3. days from date of shipment to customer Standard Imaging s sole and exclusive obligation and the purchaser s sole and exclusive remedy under the above warranties are at Standard Imag ing s option limited to repairing replacing free of charge or revising labeling and manual content on a product 1 which contains a defect covered by the above warranties 2 which are reported to Standard Imaging Inc not later than seven 7 days after the expiration date of the warranty period in the table 3 which are returned to Standard Imaging Inc promptly after discovery of the defect and 4 which are found to be defective upon exami nation by Standard Imaging Inc Transportation related charges including but not limited to shipping customs tariffs taxes and brokerage fees to Standard Imaging are the buyer s responsibility This warranty extends to every part of the product except consumables fuses batteries or glass breakage Standard Imaging Inc shall not be otherwise liable for any damages including but not limited to incidental damages consequential damages or special damages Repaired or replaced products are war ranted for the balance of the original warranty period or at least 90 days This warranty is in lieu of all other warranties express or implied whether statutory or otherwise including any implied warranty of fit ness for a particular purpose In no event shall Standard Imaging Inc be liable
4. 92706 A1SL 92722 A2 92718 P2 92720 T2 92721 A12 92700 A12S 92725 A14 92711 T14 92712 A14P 92713 T14P 92714 A14SL 92723 A16 92726 A18 92729 A19 92734 Table of Contents 4 General Precautions 5 General Operation 7 Calibration 8 Parts and Accessories 8 General Chamber Specifications 9 Model 1 Miniature Shonka Chamber 9 Model A1SL Slimline Miniature Shonka Chamber 10 Model 2 Spokas Chamber 10 Model A12 Farmer Type Chamber 11 Model A12S 0 25 cc Farmer Type Chamber 11 Model 14 Microchamber 12 Model 14P Parallel Plate Microchamber 12 Model A14SL Slimline Microchamber 13 Model A16 Slimline Microchamber 13 Model A18 0 125 cc Slimline Chamber 14 Model A19 Classic Farmer Type lon Chamber 14 Service Notes 16 Service Policy 17 Customer Responsibility 18 Warranty mi STANDARDIMAGING 3 7601 MURPHY DRIVE MIDDLETON WI 53562 2532 USA WWW STANDARDIMAGING COM General Operation Exradin thimble chambers are attached to a 1 5 m length of low noise flexible triaxial cable that is terminated by a triaxial or coaxial connector The collector of the chamber is common with the center wire ofthe cable and the center contact of the connector The guard is common with the inner cable braid and the middle connector contact in the case of triaxial connectors and the connector body in the case of coaxial connectors The shell outer electrode usually ground is common with the outer braid of the cable and the connector body
5. a specific shipper Items found to be out of warranty are subject to a minimum service fee of 1 hour labor excluding recalibrations for diagnostic efforts and require a purchase order PO before service is performed With concurrence from customer the product may be replaced if it is unserviceable or if the required service is cost prohibitive Products incurring service charges may be held for payment Standard Imaging does not provide loaner products See the Standard Imaging Warranty and Customer Responsibility for additional information Serialization Information Standard Imaging products that are serial ized contain coded logic in the serial number which indicates the product day and year of manufacture and a sequential unit number for identification AYY DDD X A Unique product ID YY Last two digits of the year e g 1999 99 2000 00 DDD Day of the year 1 lt DDD lt 365 x Unique unit ID Number 1 lt X lt 9 16 Customer Responsibility This product and its components will perform properly and reliably only when operated and maintained in accordance with the instructions contained in this manual and accom panying labels A defective device should not be used Parts which may be broken or missing or are clearly worn distorted or contaminated should be replaced immediately with genuine replacement parts manufactured by or made available from Standard Imaging Inc CAUTION Federal law in the U S A and C
6. for any incidental or consequential damages resulting from the use misuse or abuse of the product or caused by any defect failure or malfunction of the product whether a claim of such dam ages is based upon the warranty contract negligence or otherwise This warranty represents the current standard warranty of Standard Imaging Inc Please refer to the labeling or instruction manual of your Standard Imaging Inc product or the Standard Imaging Inc web page for any warranty conditions unique to the product 18
7. in the case of triaxial con nectors and the pigtail extending out the rear of coaxial connectors The design of Exradin chambers requires that the collector and guard operate at essentially the same potential The polarizing potential supplied by an electrometer is ap plied between the shell and the guard as shown in Figure General Operation Continued 1 Either polarity may be applied to the shell and either the shell or guard may be grounded Safety and other considerations recommend grounding the shell which then requires an electrometer with a floating input All Exradin chambers can support 1000 V between shell and guard However depending on the particular circum stance and radiation intensity as little as 90 V may yield essentially 100 charge collection GUARD SHELL ere p 5 ELECTROMETER LOW NOISE Figure 1 Thimble Chamber and Electrometer Because Exradin onization chambers do not exhibit volt age soakage phenomena readings of ionization current may be made immediately after application of the polar izing potential However it is good practice to pause a minute or two after changing the potential to allow switch ing transients induced in the electrometer to completely subside Such transients are most evident in the rate current mode Operating Instructions 1 With nothing connected to the input jack of the elec
8. of original delivery to the purchaser or a distributor this Standard Imaging Inc product provided in the table is warranted against functional defects in design materials and workmanship provided it is properly operated under conditions of normal use and that repairs and replacements are made in accordance herewith The foregoing warranty shall not apply to normal wear and tear or if the product has been altered disassembled or repaired other than by Standard Imaging Inc or if the product has been subject to abuse misuse negligence or accident Product Warranty Period Standard Imaging 2 years lonization Chambers y Standard Imaging Well Chambers 2 years Standard Imaging Electrometers 2 years Standard Imaging Deals BeamChecker Products y Standard Imaging inaa Software Products y All Other Standard diyear Imaging Products y Standard Imaging ivaa Custom Products y Standard Imaging Remanufactured Products 180 days Standard Imaging Custom Select Products 90 days Consumables 90 days Serviced Product 90 days Resale Products As defined by the Original Equipment Manufacturer ADCL Product Calibration 0 90 days 100 of ADCL Calibration Costs Standard Imaging uses 91 182 days 75 of ADCL Calibration Costs the UW ADCL for 183 365 days 50 of ADCL Calibration Costs recalibrations required 366 639 days 25 of ADCL Calibration Costs under warranty
9. trometer turn the power on and wait at least 15 minutes for warm up 2 Verify the leakage of the electrometer is within the manufacturer s stated acceptable limits 3 Connect the onization chamber to the electrometer and apply 100 voltage bias 4 Allow the electrometer and onization chamber system at least 10 minutes to stabilize making certain that all cabling is lying flat and unkinked 5 Verify the leakage of the ionization chamber is within the manufacturer s stated acceptable limits If measured in the presence of background sources note that this signal will add to the leakage of the chamber General Operation Continued 6 Some electrometers such as the Standard Imaging MAX 4000 Electrometer allow the user to zero the device at any time If desired perform this system zeroing now 7 Check the system leakage Take a reading without ex posing the chamber to radiation This reading should be less than 0 1 of the final signal expected If it is not the leakage should be subtracted from the signal 8 Measure atmospheric temperature and pressure 9 Insert the ion chamber and take at least 3 measurements Generally the measurements should not be moving in only one direction i e three readings that continue to drop and hence may not yet be stabilized If a current measurement is done allow sufficient time for value to stabilize 10 Analyze the data taking into account the average of the readings s
10. 0 5 mm Delrin A12 15 MeV cap 37 4 mm Delrin A12 18 MeV cap 44 0 mm Delrin A14P Co 60 Cap 2 0 mm C552 T14P Co 60 Cap 4 0 mm A150 A18 Co 60 Cap 2 0 mm C552 A19 Co 60 Cap 2 8 mm C552 RSVP Phantom Adaptation for models 1 2 12 and 14 only RSVP Phantom Adaptation for models A1SL A14SL and A16 only General Chamber Specifications Nominal Collection Efficiency 100 Maximum Polarizing Potential No greater than 1000 V Nominal Inherent Leakage Currents Less than 3x 10 A Low Noise Triaxial Cable 50 ohms 29 pF ft 1 5 m long Signal Connector Triaxial BNC Plug 2 Lug male pin others available upon request High Voltage Connector Integral with triaxial connector shell of chamber is common with connector body Humidity 30 70 non condensing Temperature 15 35 C Pressure 650 770 mm Hg Product Standards IEC 60601 1 IEC 60731 gag 1 Designed to Meet 8 Model 1 Miniature Shonka Chamber A1 REF 92705 T1 REF 92706 Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material 0 056 cm 60 R nC 4 0 mm from tip of chamber 1 0mm 6 0 mm 1 0mm A1 Shonka Air Equiv plastic C552 T1 Shonka Tissue Equiv plastic A150 Model A1SL Slimline Miniature Shonka Chamber A1SL REF 92722
11. Tissue Equiv plastic A150 Model A14SL slimline Microchamber A14SL REF 92723 A 2 72 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material 0 009 cm 365 R nC Approximately 2 1 mm from tip of chamber 0 33 mm 6 25 mm 1 1 mm A14SL Shonka Air Equiv plastic C552 12 Model A16 Slimline Microchamber A16 REF 92726 2 5 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material Included Co Buildup Cap 0 007 cm 450 R nC Approximately 1 7 mm from tip of chamber 0 33 mm 3 4mm 0 5 mm A16 Shonka Air Equiv plastic C552 Wire Conduc tive Plastic Wall thickness of 2 5 mm constructed of C552 Model A18 0 125 cc Slimline Chamber A18 REF 92729 8 25 mm 4 Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter Sensitive Region Wall Thickness Shell Collector and Guard Material Included Co Buildup Cap 0 125 cm 25 R nC 4 9 mm from tip of chamber 1 0 mm 6 9 mm 1 0 mm A18 Shonka Air Equiv plastic C552 Wall thickness of 2 0 mm constru
12. a nadian law restrict the sale distribution or use of this product to by or on the order of a licensed medical practitioner The use of this product should be restricted to the supervision of a qualified medical physicist Measurement of high activity radioactive sources is potentially hazardous and should be performed by quali fied personnel Should repair or replacement of this product become necessary after the warranty period the customer should seek advice from Standard Imaging Inc prior to such repair or replacement If this product is in need of repair it should not be used until all repairs have been made and the product is functioning properly and ready for use After repair the product may need to be calibrated The owner of this product has sole responsibility for any malfunction resulting from abuse improper use or maintenance or repair by anyone other than Standard Imaging Inc The information in this manual is subject to change without notice No part of this manual may be copied or reproduced in any form or by any means without prior written consent of Standard Imaging Inc 17 Warranty Standard Imaging Inc sells this product under the warranty herein set forth The warranty is extended only to the buyer purchasing the product directly from Standard Imaging Inc or as a new product from an authorized dealer or distributor of Standard Imaging Inc For a period provided in the table below from the date
13. cted of C552 13 Model A19 Classic Farmer Type lon Chamber A19 REF 92734 m 21 6 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter Sensitive Region Wall Thickness Shell Collector and Guard Material Included Co Buildup Cap 0 62 cm 5 R nC 12 8 mm from tip of chamber 1 0 mm 7 0 mm 0 5 mm A19 Shonka Air Equiv plastic C552 Wall thickness of 2 8 mm constructed of C552 Service Notes Calibration Cap Calibration caps constructed of the same material as the major elements of the chamber are available to provide more than adequate build up for Cobalt 60 radiation To seat cap on chamber push cap onto chamber while slightly rotating clockwise When the cap is fully seated it will bottom on the shell tip and provide a small gap between the bottom of the cap and shell step To remove cap for measurements either in lower energy beams or in a liquid phantom merely pull on cap while again rotating cap clockwise Stem 1 2 12 12S 14 and 14P only The two piece stem configuration is a 1 3 cm OD black phenolic with 5 1 and 12 7 cm segments They are threaded together and can be separated if desired Dif ferent stem configurations are available In every case the stem is threaded onto the base ofthe chamber proper The stem may be separated from the chamber to provide greater mobility of
14. mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material Included Co Buildup Cap 0 25 cm 14 R nC 5 8 mm from tip of chamber 1 0 mm 7 1mm 0 5 mm A12S Shonka Air Equiv plastic C552 Wall thickness of 2 8 mm constructed of C552 Model 14 Microchamber A14 REF 92711 T14 REF 92712 2 72 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Outside Diameter of Shell Collecting Volume Wall Thickness Shell Collector and Guard Material 0 009 cm 365 R nC Approximately 2 0 mm from tip of chamber 0 33 mm 6 0 mm 1 0 mm A14 Shonka Air Equiv plastic C552 Wire Conduc tive Plastic T14 Shonka Tissue Equiv plastic A150 11 Model 14P Parallel Plate Microchamber A14P REF 92713 T14P REF 92714 E 2 Zo 1 0 mm Collecting Volume Nominal Calibration Factor Centroid of Collecting Volume Collector Diameter Window Thickness Window Collector Gap Outside Diameter of Shell Collecting Volume Shell Collector and Guard Material 0 002 cm 1430 R nC 1 5 mm from tip of chamber 1 5 mm 1 0 mm 1 0 mm 6 0 mm A14P Shonka Air Equiv plastic C552 T14P Shonka
15. r all segments of the stem from the chamber body will not effect the waterproofness of the chamber Service and Maintenance There are no user serviceable parts within these ionization chambers Under no circumstance should the user attempt to repair or disassemble the chamber and or connector as the warranty will become void and the calibration factor will change Under normal use the chambers should provide years of trouble free service If assistance is desired in the proper disposal of this product including accessories and components after its useful life please return to Standard Imaging 15 Service Policy If service including recalibration is required please con tact Standard Imaging s Customer Service department by phone or email prior to shipping the product Standard Imaging s Customer Service and Technical Service staff will attempt to address the product issue via phone or email If unable to address the issue a return material authoriza tion RMA number will be issued With the RMA number the product can be returned to Standard Imaging It is the responsibility of the customer to properly package insure and ship the product with the RMA number clearly identi fied on the outside of the package The customer must immediately file a claim with their carrier for any shipping damage or lost shipments Return shipping and insurance is to be pre paid or billed to the customer and the customer may request
16. the chamber when operating in a liquid phantom The cable connector prevents complete removal of the stem In unscrewing the stem from the base of the chamber the chamber must be gripped in the region be tween the shell and stem Under no circumstances should the chamber be held by the shell when removing the stem as such may result in unscrewing of the shell 14 Service Notes Continued Stem A1SL A14SL A16 A18 and A19 only The one piece black aluminum stem is an integral part of the ionization chamber assembly and is not to be removed under any circumstances A1SL A14SL A16 0 64 cm OD 5 5 cm long A18 0 69 cm OD 5 5 cm long A19 1 3 cm OD 4 6 cm long Vent Tube All Exradin ionization chambers now utilize a rugged flexible tube to allow the chamber to vent This tube is sealed to the chamber body and is open to the ambient near the connector The triaxial cable of the chamber passes through this vent tube DO NOT attempt to alter or remove this vent tube from the chamber under any circumstance Doing so will void the warranty allow the chamber to leak if placed in water and or possibly loosen the cable from the chamber thereby destroying any calibration factor Any modifications should be only done by Standard Imaging Inc Underwater Operation All Exradin thimble chambers are inherently waterproof they require no sleeves caps or other devices to achieve this For those models with removable stems removing any o
17. ystem leakage temperature pressure corrections calibration factors and any other appropriate corrections to be made Keep in mind that the calibration factor consists of the electrometer calibration and the ionization chamber calibration factor 11 When all measurements are completed set bias volt age to 0 VDC turn off the electrometer and disconnect the ionization chamber Calibration As is standard practice for other ionization chambers it is recommended that Exradin chambers be calibrated every 2 years This calibration should be performed by an Accredited Dosimetry Calibration Laboratory ADCL Standard Imaging offers calibrations from the University of Wisconsin ADCL You need only one purchase order to cover calibrations shipping and handling and service Standard Imaging hand carries all instruments to and from the University of Wisconsin ADCL Parts and Accessories REF 72122 72125 72123 72126 72129 72128 72141 72206 72207 72161 72159 72162 72163 72164 72160 72138 72139 72725 72762 72140 72169 Description A1 A14 Co 60 Cap 2 0 mm C552 A1SL A14SL Co 60 Cap 2 0 mm C552 T1 T14 Co 60 Cap 4 0 mm A150 A2 Co 60 Cap 2 0 mm C552 T2 Co 60 Cap 4 0 mm A150 P2 Co 60 Cap 4 0 mm D400 A16 Co 60 Cap 2 5 mm C552 A12 Co 60 cap 2 8 mm C552 A12S Co 60 cap 2 8 mm C552 A12 4 MeV cap 10 5 mm Delrin A12 6 MeV cap 15 8 mm Delrin A12 10 MeV cap 25 7 mm Delrin A12 12 MeV cap 3
Download Pdf Manuals
Related Search