STM_51275-13.pdf

ISO/ASTM 51275:2013(E)Standard Practice forUse of a Radiochromic Film Dosimetry System1This standard is issued under the fixed designation ISO/ASTM 51275;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.1.Scope1.1 This is a practice for using radiochromic film dosimetrysystems to measure absorbed dose in materials irradiated byphotons or electrons in terms of absorbed dose to water.Radiochromic film dosimetry systems are generally used asroutine dosimetry systems.1.2 The radiochromic film dosimeter is classified as a TypeII dosimeter on the basis of the complex effect of influencequantities.See ASTM Practice E2628.1.3 This document is one of a set of standards that providesrecommendations for properly implementing dosimetry inradiation processing,and describes a means of achievingcompliance with the requirements of ASTM E2628“Practicefor Dosimetry in Radiation Processing”for a radiochromic filmdosimetry system.It is intended to be read in conjunction withASTM E2628.1.4 This practice covers the use of radiochromic filmdosimetry systems under the following conditions:1.4.1 The absorbed dose range is 1 Gy to 150 kGy.1.4.2 The absorbed dose rate is 1 10-2to 1 1013Gys-1(1-4).21.4.3 The photon energy range is 0.1 to 50 MeV.1.4.4 The electron energy range is 70 keV to 50 MeV.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced documents2.1 ASTM Standards:3E170 Terminology Relating to Radiation Measurements andDosimetryE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible SpectrophotometersE2628 Practice for Dosimetry in Radiation ProcessingE2701 Guide for Performance Characterization of Dosim-eters and Dosimetry Systems for Use in Radiation Pro-cessing2.2 ISO/ASTM Standards:351261 Practice for Calibration of Routine Dosimetry Sys-tems for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing2.3 International Commission on Radiation Units and Mea-surements(ICRU)Reports:4ICRU Report 85a Fundamental Quantities and Units forIonizing RadiationICRU Report 80 Dosimetry Systems for Use in RadiationProcessing2.4 Joint Committee for Guides in Metrology(JCGM)Reports:JCGM 100:2008,GUM 1995,with minor corrections,Evaluation of measurement data Guide to the Expres-sion of Uncertainty in Measurement5JCGM 200:2008,VIM,International vocabulary of metrol-ogy Basis and general concepts and associated terms63.Terminology3.1 Definitions:1This guide is under the jurisdiction of ASTM Committee E61 on RadiationProcessing and is the direct responsibility of Subcommittee E61.02 on DosimetrySystems,and is also under the jurisdiction of ISO/TC 85/WG 3.Current edition approved April 9,2013.Published June 2013.Originallypublished as ASTM E 127588.Last previous ASTM edition E 1275981.ASTME 127593 was adopted by ISO in 1998 with the intermediate designation ISO15557:1998(E).The present International Standard ISO/ASTM 51275:2013(E)replaces ISO 15557 and is a major revision of the last previous edition ISO/ASTM51275:2004(E).2The boldface numbers in parentheses refer to the bibliography at the end of thisstandard.3For referenced ASTM and ISO/ASTM standards,visit the ASTM website,www.astm.org,or contact ASTM Customer Service at serviceastm.org.ForAnnual Book of ASTM Standards volume information,refer to the standardsDocument Summary page on the ASTM website.4Available from the International Commission on Radiation Units andMeasurements,7910 Woodmont Ave.,suite 800,Bethesda,MD 20814,USA.5Document produced by Working Group 1 of the Joint Committee for Guides inMetrology(JCGM/WG 1).Available free of charge at the BIPM website(http:/www.bipm.org).6Document produced by Working Group 2 of the Joint Committee for Guides inMetrology(JCGM/WG 2).Available free of charge at the BIPM website(http:/www.bipm.org).ISO/ASTM International 2015 All rights reserved1 3.1.1 calibration curveexpression of the relation betweenindication and corresponding measured quantity value.(VIM)3.1.1.1 DiscussionIn radiation processing dosimetrystandards,the term dosimeter response is generally usedrather than indication.3.1.2 dosimeterdevice having a reproducible,measurableresponse to radiation that can be used to measure the absorbeddose in a given system.3.1.3 dosimeter batchquantity of dosimeters made from aspecific mass of material with uniform composition,fabricatedin a single production run under controlled,consistentconditions,and having a unique identification code.3.1.4 dosimetry responsereproducible,quantifiable effectproduced in the dosimeter by ionizing radiation.3.1.4.1 DiscussionFor radiochromic film dosimeters,theabsorbance,specific absorbance or specific net absorbance