STM_51956-13.pdf

ISO/ASTM 51956:2013(E)Standard Practice forUse of a Thermoluminescence-Dosimetry System(TLDSystem)for Radiation Processing1This standard is issued under the fixed designation ISO/ASTM 51956;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 practice covers procedures for the use of thermolu-minescence dosimeters(TLDs)to measure the absorbed dosein materials irradiated by photons or electrons in terms ofabsorbed dose to water.Thermoluminescence-dosimetry sys-tems(TLD systems)are generally used as routine dosimetrysystems.1.2 The thermoluminescence dosimeter(TLD)is classifiedas a type II dosimeter on the basis of the complex effect ofinfluence quantities on the dosimeter response.See ISO/ASTMPractice 52628.1.3 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 ISO/ASTM 52628“Prac-tice for Dosimetry in Radiation Processing”for a TLD system.It is intended to be read in conjunction with ISO/ASTM 52628.1.4 This practice covers the use of TLD systems under thefollowing conditions:1.4.1 The absorbed-dose range is from 1 Gy to 10 kGy.1.4.2 The absorbed-dose rate is between 1 10-2and 1 1010Gy s-1.1.4.3 The radiation-energy range for photons and electronsis from 0.1 to 50 MeV.1.5 This practice does not cover measurements of absorbeddose in materials subjected to neutron irradiation.1.6 This practice does not cover procedures for the use ofTLDs for determining absorbed dose in radiation-hardnesstesting of electronic devices.Procedures for the use of TLDsfor radiation-hardness testing are given in ASTM PracticeE668.1.7 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 andDosimetryE666 Practice for Calculating Absorbed Dose From Gammaor X RadiationE668 Practice for Application of Thermoluminescence-Dosimetry(TLD)Systems for Determining AbsorbedDose in Radiation-Hardness Testing of Electronic Devices2.2 ISO/ASTM Standards:251261 Practice for Calibration of Routine Dosimetry Sys-tems for Radiation Processing51608 Practice for Dosimetry in an X-Ray(Bremsstrahlung)Facility for Radiation Processing51649 Practice for Dosimetry in an Electron-Beam Facilityfor Radiation Processing at Energies Between 300 keVand 25 MeV51702 Practice for Dosimetry in Gamma Irradiation Facili-ties for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing51939 Practice for Blood Irradiation Dosimetry51940 Guide for Dosimetry for Sterile Insect Release Pro-grams52628 Practice for Dosimetry in Radiation Processing52701 Guide for Performance Characterization of Dosim-eters and Dosimetry Systems for Use in Radiation Pro-cessing2.3 Joint Committee for Guides in Metrology(JCGM)Reports:JCGM 100:2008,GUM 1995,with minor corrections,Evaluation of measurement dataGuide to the Expres-sion of Uncertainty in Measurement31This 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 Aug.1,2013.Published November 2013.Originallypublished as ASTM E 195698.The present International Standard ISO/ASTM51956:2013(E)is a major revision of the last previous edition ISO/ASTM51956:2005(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.3Document 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.ISO/ASTM International 2015 All rights reserved1 JCGM200:2008,VIM,InternationalVocabularyofMetrologyBasis and general concepts and associatedterms42.4 ISO Standard:ISO10012 MeasurementManagementSystemsRequirements for Measurement Processes and MeasuringEquipment52.5 International Commission on Radiation Units and Mea-surements(ICRU)Report:ICRU Report 85a Fundamental Quantities and Units forIonizing Radiation63.Terminology3.1 Definitions:3.1.1 annealingthermal treatment of a TLD prior to irra-diation or prior to readout.3.1.1.1 DiscussionPre-irradiation annealing of TLDs isusually done to erase the effects of previous irradiation and toreadjust the sensitivity of the phosphor;pre-readout annealingusually is done to reduce low-temperature TLD response.3.1.2 calibrationset of operations that establish,underspe