ANSI ISO ASTM 51607-2013 Standard Practice for Use of the Alanine-EPR Dosimetry System.pdf
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1、ISO/ASTM 51607:2013(E)Standard Practice forUse of an Alanine-EPR Dosimetry System1This standard is issued under the fixed designation ISO/ASTM 51607; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision.1. Scop
2、e1.1 This practice covers dosimeter materials,instrumentation, and procedures for using the alanine-EPRdosimetry system for measuring the absorbed dose in thephoton and electron radiation processing of materials. Thesystem is based on electron paramagnetic resonance (EPR)spectroscopy of free radical
3、s derived from the amino acidalanine.21.2 The alanine dosimeter is classified as a type I dosimeteras it is affected by individual influence quantities in a well-defined way that can be expressed in terms of independentcorrection factors (see ASTM Practice E2628). The alaninedosimeter may be used in
4、 either a reference standard dosimetrysystem or in a routine dosimetry system.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 “Prac
5、ticefor Dosimetry in Radiation Processing” for alanine dosimetrysystem. It should be read in conjunction with ASTM E2628.1.4 This practice covers alanine-EPR dosimetry systems fordose measurements under the following conditions:1.4.1 The absorbed dose range is between 1 and 1.5 105Gy.1.4.2 The absor
6、bed dose rate is up to 102Gy s-1for continu-ous radiation fields and up to31010Gy s-1for pulsedradiation fields (1-4).31.4.3 The radiation energy for photons and electrons isbetween 0.1 and 30 MeV (1, 2, 5-8).1.4.4 The irradiation temperature is between 78 C and +70 C (2, 9-12).1.5 This standard doe
7、s 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 Stan
8、dards:4E170 Terminology Relating to Radiation Measurements andDosimetryE2628 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:451261 Practice for Calibration of Routi
9、ne Dosimetry Sys-tems for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing2.3 ICRU Reports:5ICRU Report 85a Fundamental Quantities and Units forIonizing RadiationICRU Report 80 Dosimetry Systems for Use in RadiationProcessing2.4 Joint Committee for Gu
10、ides in Metrology (JCGM)Reports:JCGM 100:2008, GUM 1995, with minor corrections,Evaluation of measurement data Guide to the Expres-sion of Uncertainty in Measurement6JCGM 100:2008, VIM International vocabulary of metrol-ogy Basis and general concepts and associated terms73. Terminology3.1 Definition
11、s: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 April 9, 2013. Published June 2013. Originallypublished a
12、s ASTM E 1607 94. Last previous ASTM edition E 1607 961.ASTM E 1607 94 was adopted by ISO in 1998 with the intermediate designationISO 15566:1998(E). The present International Standard ISO/ASTM 51607:2013(E)replaces ISO 15566 and is a major revision of the last previous edition ISO/ASTM516072004(E).
13、2The term “electron spin resonance” (ESR) is used interchangeably withelectron paramagnetic resonance (EPR).3The boldface numbers in parentheses refer to the bibliography at the end of thisstandard.4For referenced ASTM and ISO/ASTM standards, visit the ASTM website,www.astm.org, or contact ASTM Cust
14、omer Service at serviceastm.org. ForAnnual Book of ASTM Standards volume information, refer to the standardsDocument Summary page on the ASTM website.5Available from International Commission on Radiation Units andMeasurements, 7910 Woodmont Ave., Suite 800, Bethesda, MD 20814, U.S.A.6Document produc
15、ed 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).7Document 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.
16、bipm.org). ISO/ASTM International 2017 All rights reservedThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued b
17、y the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.1 alanine dosimeterspecified quantity and physicalform of the radiation-sensitive material alanine and any addedinert substance such as a binder.3.1.2 alanine-EPR dosimetry systemsystem used for de-termining absorbed dos
18、e, consisting of alanine dosimeters, anEPR spectrometer and its associated reference materials, andprocedures for the systems use.3.1.3 alanine-EPR dosimeter responsevalue resultingfrom applied adjustments to the EPR signal amplitude.3.1.4 check standarda standard prepared independently ofthe calibr
19、ation standards that is measured to verify the perfor-mance of a dosimetry system.3.1.5 EPR intensity reference materiala stable paramag-netic material whose measurement by EPR is applied to thedosimeter EPR signal amplitude as part of the dosimeterresponse determination.3.1.6 EPR signal amplitudepe
20、ak-to-peak amplitude of thecentral signal of the EPR spectrum.3.1.6.1 DiscussionThis signal is proportional to thealanine-derived free radical concentration in the alanine do-simeter.3.1.7 EPR spectroscopymeasurement of resonant absorp-tion of electromagnetic energy resulting from the transition ofu
21、npaired electrons between different energy levels, upon ap-plication of radio frequencies to a paramagnetic substance inthe presence of a magnetic field.3.1.8 EPR spectrumfirst derivative of the electron para-magnetic absorption spectrum measured as a function of themagnetic field.3.1.9 zero dose am
22、plitudeEPR signal amplitude of anunirradiated alanine dosimeter with the same EPR spectrom-eter parameters used for the lowest measurable absorbed dosevalue.3.2 Definitions of other terms used in this standard thatpertain to radiation measurement and dosimetry may be foundin ASTM Terminology E170. D
23、efinitions in E170 are compat-ible with ICRU Report 85a; that document, therefore, may beused as an alternative reference.4. Significance and use4.1 The alanine-EPR dosimetry system provides a meansfor measuring absorbed dose. It is based on the measurement ofspecific stable free radicals in crystal
24、line alanine generated byionizing radiation.4.2 Alanine-EPR dosimetry systems are used in reference-or transfer-standard or routine dosimetry systems in radiationapplications that include: sterilization of medical devices andpharmaceuticals, food irradiation, polymer modifications,medical therapy an
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