ASTM D 1943-96 Standard Test Method for Alpha ...

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1、免费标准网(www.freebz.net)标准最全面AnAmericanNationalStandardDesignation:D1943–96StandardTestMethodfor1AlphaParticleRadioactivityofWaterThisstandardisissuedunderthe®xeddesignationD1943;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision

2、.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.ScopeD3648PracticefortheMeasurementofRadioactivity41.1Thistestmethodcoversthemeasurementofal

3、pha3.Terminologyparticleactivityofwater.Itisapplicabletoalphaemittershavingmaximumenergiesabove3.9MeVandatactivity3.1De®nitionsÐForde®nitionsoftermsusedinthistestlevelsabove0.02Bq/mLofradioactivehomogeneouswater.method,refertoTerminologyD1129.Fortermsnotde®nedinThistestmethodisnotapplicabletosamp

4、lescontainingthistestmethodorinTerminologyD1129,referencemaybemadetootherpublishedglossaries.5alpha-emittingradionuclidesthatarevolatileunderconditionsoftheanalysis.4.SummaryofTestMethod1.2Thistestmethodcanbeusedforeitherabsoluteor4.1Thetestsampleisreducedbyevaporationorasuitablerelativedetermina

5、tions.Intracerwork,theresultsmaybechemicalmethodtotheminimumweightofmaterialhavingexpressedbycomparisonwithastandardthatisde®nedtobemeasurablealphaactivity.Alpharadioactivityismeasuredby100%.Forradioassay,datamaybeexpressedintermsofalphaaninstrumentcomposedofadetectingdevice,ampli®er,powerdisinte

6、grationratesaftercalibrationwithasuitablestandard.supply,andscalerÐthemostwidelyusedbeingproportionalGeneralinformationonradioactivityandmeasurementof2andscintillationcounters.Intheproportionalcounter,whichradiationhasbeenpublishedandsummarizedinPracticemaybeofthewindowlessorthinwindowtype,alphap

7、articlesD3648.enteringthesensitiveregionofthedetectorproduceionization1.3Thisstandarddoesnotpurporttoaddressalloftheofthecountinggas.Thenegativeionoftheoriginalionpairissafetyconcerns,ifany,associatedwithitsuse.Itisthe