STM_51026-15.pdf

ISO/ASTM 51026:2015(E)Standard Practice forUsing the Fricke Dosimetry System1This standard is issued under the fixed designation ISO/ASTM 51026;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 the procedures for preparation,testing and using the acidic aqueous ferrous ammonium sulfatesolution dosimetry system to measure absorbed dose to waterwhen exposed to ionizing radiation.The system consists of adosimeter and appropriate analytical instrumentation.Thesystem will be referred to as the Fricke dosimetry system.TheFricke dosimetry system may be used as either a referencestandard dosimetry system or a routine dosimetry system.1.2 This practice 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 Practice52628 for the Fricke dosimetry system.It is intended to be readin conjunction with ISO/ASTM Practice 52628.1.3 The practice describes the spectrophotometric analysisprocedures for the Fricke dosimetry system.1.4 This practice applies only to gamma radiation,X-radiation(bremsstrahlung),and high-energy electrons.1.5 This practice applies provided the following are satis-fied:1.5.1 The absorbed dose range shall be from 20 to 400 Gy(1).21.5.2 The absorbed-dose rate does not exceed 106Gys1(2).1.5.3 For radioisotope gamma sources,the initial photonenergyisgreaterthan0.6MeV.ForX-radiation(bremsstrahlung),the initial energy of the electrons used toproduce the photons is equal to or greater than 2 MeV.Forelectron beams,the initial electron energy is greater than 8MeV.NOTE1The lower energy limits given are appropriate for a cylindricaldosimeter ampoule of 12 mm diameter.Corrections for displacementeffects and dose gradient across the ampoule may be required for electronbeams(3).The Fricke dosimetry system may be used at lower energies byemploying thinner(in the beam direction)dosimeter containers(see ICRUReport 35).1.5.4 The irradiation temperature of the dosimeter should bewithin the range of 10 to 60C.1.6 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:3C912 Practice for Designing a Process for Cleaning Techni-cal GlassesE170 Terminology Relating to Radiation Measurements andDosimetryE178 Practice for Dealing With Outlying ObservationsE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible SpectrophotometersE666 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 DevicesE925 Practice for Monitoring the Calibration of Ultraviolet-Visible Spectrophotometers whose Spectral Bandwidthdoes not Exceed 2 nmE958 Practice for Estimation of the Spectral Bandwidth ofUltraviolet-Visible Spectrophotometers2.2 ISO/ASTM Standards:351261 Practice for Calibration of Routine Dosimetry Sys-tems for Radiation Processing51707 Guide for Estimating Uncertainties in Dosimetry forRadiation Processing52628 Practice for Dosimetry in Radiation Processing2.3 ISO/IEC Standard:ISO/IEC 17025 General requirements for the competence oftesting and calibration laboratories41This 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.9,2015.Published June 2015.Originallypublished as ASTM E102684.Last previous ASTM edition E1026 13.Thepresent International Standard ISO/ASTM 510262015(E)replaces ASTME1026 13.2The boldface numbers that appear in parentheses refer to a bibliography at theend of this practice.3For referenced ASTM and ISO/ASTM standards,visit the ASTM webiste,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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.ISO/ASTM International 2015 All rights reserved1 2.4 International Commission on Radiation Units and Mea-surements(ICRU)Reports:5ICRU Report 14 Radiation Dosimetry:X Rays and GammaRays with Maximum Photon Energies Between 0.6 and 50MeVICRU Report 35 Radiation Dosimetry:Electrons with InitialEnergies Between 1 and 50 MeVICRU Report 64 Dosimetry of High-Energy Photon Beamsbased on Standards of Absorbed Dose to WaterICRU Report 80 Dosimetry Systems for Use in RadiationProcessingICRU Report 85a Fundamental Qua