1、Designation:D507209(Reapproved 2016)Standard Test Method forRadon in Drinking Water1This standard is issued under the fixed designation D5072;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in paren
2、theses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of radon indrinking water in concentrations above 2 Bq/L.1.2 This test method may be used for absolute measure-men
3、ts by calibrating with a226Ra standard or for relativemeasurements by comparing the measurements made witheach other.1.3 This test method is used successfully with drinkingwater samples and Type III reagent water conforming toSpecification D1193.It is the users responsibility to ensure thevalidity o
4、f this test method for waters of untested matrices.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility
5、 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:2D1129 Terminology Relating to WaterD1193 Specification for Reagent WaterD2777 Practice for Determinati
6、on of Precision and Bias ofApplicable Test Methods of Committee D19 on WaterD3370 Practices for Sampling Water from Closed ConduitsD7902 Terminology for Radiochemical AnalysesD5847 Practice for Writing Quality Control Specificationsfor Standard Test Methods for Water Analysis2.2 Other Documents:Mult
7、i-Agency Radiological Laboratory Analytical ProtocolsManual EPA402-B-04-001A,NUREG1576,NTISPB2004-105421,July 20043.Terminology3.1 Definitions:3.2 For definitions of terms used in this standard,refer firstto Terminology D7902 and second to Terminology D1129.Forterms not defined in this standard,or i
8、n Terminologies D7902or D1129,reference may be made to other published glossa-ries.4.Summary of Test Method4.1 This test method is based on the scintillation countingof222Rn and its progeny.4.2 In a glass liquid scintillation vial,an aliquot of unaeratedwater is drawn into a syringe then gently inje
9、cted beneath 10mL of a suitable liquid scintillation cocktail that does notcontain an emulsifier.The vials are capped,shaken,andallowed to stand 3 hours prior to counting to permit darkadaptation and buildup of short-lived radon progeny.Radon-222 contained in the sample is selectively partitioned in
10、to thescintillation cocktail.The sample is counted using a liquidscintillation counting system optimized for detection of222Rnactivity.5.Significance and Use5.1 The most prevalent of the radon isotopes in groundwater is222Rn.This isotope presents the greatest health riskcompared to the other natural
11、ly occurring radon isotopes ifingested via the water pathway.6.Interferences6.1 Other radionuclides soluble in the scintillation cocktailmay interfere.High energy beta/gamma emitters,even thoughthey are not soluble in the scintillation mix,may also interfere.These interferences will cause a high bia
12、s if present in asignificant quantity.These interferences would be rare indrinking water samples but may be observed in some cases.6.2 A reduced or increased counting efficiency may result ifsample quenching is significantly different than that of thecalibration standard.6.3 Scintillation stock cock
13、tails and sample cocktail mixesmust be dark-adapted to prevent artificial excitation of fluors1This test method is under the jurisdiction of ASTM Committee D19 on Waterand is the direct responsibility of Subcommittee D19.04 on Methods of Radiochemi-cal Analysis.Current edition approved Feb.1,2016.Pu
14、blished February 2016.Originallyapproved in 1992.Last previous edition approved in 2009 as D5072 091.DOI:10.1520/D5072-09R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer
15、 to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 which may lead to falsely elevated count rates which couldcompromise data quality.7.Apparatus7.1 Sampling Funnel.7.2 Tube,with stan
16、dard faucet fitting.7.3 Disposable Syringe,12 mL capacity,with 20 gauge,38mm hypodermic needle.7.4 Glass Liquid Scintillation Vials,20 mL capacity withpolyethylene inner seal cap liners.7.5 Liquid Scintillation Counter.8.Reagents and Materials8.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such speci
