Document Details


Title:
INTERNATIONAL STANDARD REFERENCE RADIATIONS AND THEIR APPLICATION TO THE TYPE TESTING OF DOSIMETRIC APPARATUS
Author(s):
Subject Terms:
DOSIMETRY; REGULATIONS; DOSEMETERS; CALIBRATION; CALIBRATION STANDARDS; IONIZATION CHAMBERS; COMPARATIVE EVALUATIONS; TESTING; RECOMMENDATIONS; COMMENTARY; GEIGER-MUELLER COUNTERS; DATA
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1977 Dec 09
Declassification Status:
Never classified
Document Pages:
0034
Accession Number:
NV0062678
Document Number(s):
IAEASM22224
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
IN RECENT YEARS A SIGNIFICANT NUMBER OF INTERNATIONAL RECOMMENDATIONS HAVE BEEN ISSUED OR DRAFTED ON THE PERFORMANCE REQUIREMENTS OF RADIATI ON MONITORING EQUIPMENT AND PERSONAL DOSEMETERS. THERE HAS ALSO BEEN AN INCREASING AWARENESS AT NATIONAL LEVEL OF THE NEED TO CALIBRATE AND EVALUATE SUCH EQUIPMENT AND IN SOME COUNTRIES THERE ARE LEGAL REQUIRE MENTS FOR THE APPROVAL FOR VERIFICATION OF RADIATION PROTECTION DOSIME TERS. ALL THESE RECOMMENDATIONS INCLUDE IN THEIR SPECIFICATIONS THE P ERMITTED VARIATIONS OF RESPONSE TO X-RAYS, GAMMA, BETA AND NEUTRON RAD IATIONS. FOR THE EVALUATION OF EQUIPMENT TO THESE SPECIFICATIONS TO B E ADEQUATELY PERFORMED IT IS ESSENTIAL THAT NOT ONLY SHOULD SECONDARY LABORATORIES USE THE SAME RADIATIONS BUT THAT THESE RADIATIONS SHALL H AVE BEEN PROPERLY EXPLORED AND BE INTERNATIONALLY ACCEPTED. A WORKING GROUP OF THE INTERNATIONAL STANDARDS ORGANISATION (ISO) HAS COMPLETED THE DRAFT DOCUMENT ON X AND GAMMA REFERENCE RADIATIONS AND WORK IS WE LL ADVANCED ON THE BETA REFERENCE RADIATIONS. PRIOR TO ADOPTION THE R ADIATIONS WERE PRODUCED AT LABORATORIES IN DIFFERENT COUNTRIES AND THE MEASURED SPECTRA WERE INTERCOMPARED. THIS REPORT DESCRIBES THE USE O F THESE X, GAMMA AND BETA RADIATIONS FOR THE ASSESSMENT OF COMMERCIAL DOSIMETRIC APPARATUS. THE I.S.O. STANDARD X-RADIATIONS CAN BE PRODUCE D BY USING FILTERED X-RAY BEAMS AND BY THE EXCITATION OF FLUORESCENT R ADIATION. A COMPARISON OF INSTRUMENT RESPONSES OBTAINED FOR 20 PERCEN T, 30 PERCENT AND 50 PERCENT RESOLUTION FILTERED BEAMS AND THE FLUORES CENT X-RAYS IS GIVEN. THEIR USE FOR THE ASSESSMENT OF SURFACE AND DEP TH DOSE EQUIVALENT RATE METERS, THE PROBLEMS OF THE MEASUREMENT OF DOS E RATE FROM THE RADIATIONS AND OF RELATING THE STANDARDS TO PRIMARY ST ANDARDS ARE ALSO DISCUSSED. SINCE STANDARDISATION FOR ITS OWN SAKE IS UNACCEPTABLE IT IS IMPORTANT THAT THE DERIVED BENEFITS SHOULD BE CLEA RLY KNOWN BEFORE IT IS UNDERTAKEN. WHILE THE BENEFITS OF STANDARDISAT ION IN RADIATION THERAPY AND MEDICAL DIAGNOSIS ARE OBVIOUS, FOR RADIAT ION PROTECTION THEY ARE NOT ALWAYS SO APPARENT. THE ADVANTAGES AND DI SADVANTAGES OF FORMULATING STANDARDS FOR THE CALIBRATION AND ASSESSMEN T AS WELL AS IN THE SPECIFICATION OF HEALTH PHYSICS INSTRUMENTS ARE TH EREFORE DISCUSSED AND CONTRASTED.


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