STM_51276-12.pdf

ISO/ASTM 51276:2012(E)An American National StandardStandard Practice forUse of a Polymethylmethacrylate Dosimetry System1This standard is issued under the fixed designation ISO/ASTM 51276;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 polymethylmethacrylate(PMMA)dosimetry systems to measure absorbed dose inmaterials irradiated by photons or electrons in terms ofabsorbed dose to water.The PMMA dosimetry system isclassified as a routine dosimetry system.1.2 The PMMA dosimeter is classified as a Type II dosim-eter on the basis of the complex effect of influence quantities(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 PMMAdosimetrysystem.It is intended to be read in conjunction with ASTME2628.1.4 This practice covers the use of PMMA dosimetrysystems under the following conditions:1.4.1 the absorbed dose range is 0.1 kGy to 150 kGy.1.4.2 the absorbed dose rate is 1 3 102to 1 3 107Gys1.1.4.3 the photon energy range is 0.1 to 25 MeV.1.4.4 the electron energy range is 3 to 25 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:2E170 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:251261 Guide for Selection and Calibration of DosimetrySystems for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing2.3International Commission on Radiation Units andMeasurements(ICRU)Reports:3ICRU Report 60 Fundamental Quantities and Units forIonizing RadiationICRU Report 80 Dosimetry Systems for Use in RadiationProcessing2.4ISO Reports:4GUM Guide to the Expression of Uncertainty in Measure-ment,1995.VIM International Vocabulary of Basic and General Termsin Metrology,20083.Terminology3.1 Definitions:3.1.1 calibration curveexpression of the relation betweenindication and corresponding measured quantity value(VIM).3.1.1.1 Discussionin radiation processing dosimetry stan-dards,the term dosimeter response is generally used rather than“indication”.Thus,a calibration curve is an expression of therelation between the dosimeter response and the correspondingmeasured quantity value.3.1.2 dosimetera device that,when irradiated,exhibits aquantifiable change that can be related to absorbed dose in agiven material using appropriate measurement instruments andprocedures.3.1.3 dosimeter batchquantity of dosimeters made from aspecific mass of material with uniform composition,fabricatedin a single production run under controlled,consistent condi-tions,and having a unique identification code.3.1.4 dosimeter responsereproducible,quantifiable effectproduced in the dosimeter by ionizing radiation.NOTE1For PMMA dosimeters,the specific absorbance is the dosim-eter response.3.1.5 dosimeter stockpart of a dosimeter batch held by theuser.1This 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 Feb.22,2012.Published July 2012.Originallypublished as E 1276 88.ASTM E 1276-961was adopted by ISO in 1998 withthe intermediate designation ISO 15558:1998(E).The present Third Edition ofInternational Standard ISO/ASTM 51276:2012(E)is a major revision of the SecondEdition of ISO/ASTM 51276:2002(E).2For 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.3Available from International Commission on Radiation Units and Measure-ments,7910 Woodmont Ave.,Suite 800,Bethesda,MD 20814,U.S.A.4Available from International Organization for Standardization(ISO),1,ch.dela Voie-Creuse,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.org1 ISO/ASTM International 2012 All rights reserved 3.1.6 measurement management systemset of interrelatedor interacting elements necessary to achieve metrologicalconfirmation and continual control of measurement processes.3.1.7 polymethylmethacrylate(PMMA)dosimeterpiece ofspecially selected or devel