STM_51650-13.pdf

ISO/ASTM 51650:2013(E)An American National StandardStandard Practice forUse of a Cellulose Triacetate Dosimetry System1This standard is issued under the fixed designation ISO/ASTM 51650;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 a cellulose triacetate(CTA)dosimetry system to measure absorbed dose in materialsirradiated by photons or electrons in terms of absorbed dose towater.The CTA dosimetry system is classified as a routinedosimetry system.1.2 The CTA dosimeter is classified as a type II dosimeteron the basis of the complex effect of influence quantities on itsresponse(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 CTA dosimetrysystem.It is intended to be read in conjunction with ASTME2628.1.4 This practice covers the use of CTA dosimetry systemsunder the following conditions:1.4.1 The absorbed dose range is 10 kGy to 300 kGy.1.4.2 The absorbed-dose rate range is 3 Gy/s to 431010Gy/s(1).21.4.3 The photon energy range is 0.1 to 50 MeV.1.4.4 The electron energy range is 0.2 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 Performanceof Ultraviolet and Visible SpectrophotometersE2628 Practice for Dosimetry in Radiation ProcessingE2701 Guide for Performance Characterization of Dosim-eters and Dosimetry Systems for Use in Radiation Process-ing2.2ISO/ASTM Standards:351261 Practice for Calibration of Routine Dosimetry Sys-tems for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing2.3International Commission on Radiation Units andMeasurements(ICRU)Reports:4ICRU Report 85a Fundamental Quantities and Units forIonizing RadiationICRU Report 80 Dosimetry Systems for Use in RadiationProcessing2.4Joint 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:3.1.1 absorbed-dose mappingmeasurement of absorbeddose within an irradiated product to produce a one-,two-orthree-dimensional distribution of absorbed dose,thus renderinga map of absorbed-dose values.3.1.1.1 DiscussionThe CTA dosimeter strip with appro-priate length provides the opportunity for high resolutionmeasurement of dose distribution,such as depth dose distribu-tion.3.1.2 absorbed-dose rate(D)absorbed dose in a materialper incremental time interval,i.e.,the quotient of dD by dt.Also see E170.The SI unit is Gy s-1.(ICRU-60,4.2.6)D5 dD/dt(1)3.1.2.1 Discussion(1)The absorbed-dose rate is oftenspecified in terms of its average value over longer timeintervals,for example,in units of Gymin-1or Gyh-1.(2)In1This practice 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 by April 9,2013.Published June 2013.Originallypublished as ASTM E 165094 with title:Practice for Use of Cellulose AcetateDosimetry Systems.ASTM E 165094 was adopted by ISO in 1998 with theintermediate designation ISO 15570:1998(E).The present Third Edition of Inter-national Standard ISO/ASTM 51650:2013(E)is a major revision of the SecondEdition of ISO/ASTM 51650:2005(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 and Measure-ments,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).1 ISO/ASTM International 2013 All rights reservedgamma industrial irradiators,dose rate may be significantlydifferent at diffe