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低本底伽玛能谱仪测定地质样品中钾含量研究.docx

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低本底伽玛能谱仪测定地质样品中钾含量研究 Title:DeterminationofPotassiumContentinGeologicalSamplesusingaLowBackgroundGammaSpectrometer Introduction: Themeasurementofpotassiumcontentingeologicalsamplesisofgreatimportanceinvariousfieldssuchasgeology,mineralogy,andenvironmentalstudies.Potassiumisoneofthemajorelementsfoundinmineralsandrocksanditsquantificationprovidesvaluableinformationaboutthegeologicalprocessesinvolvedintheformationofthesesamples.Inthisstudy,alowbackgroundgammaspectrometerwasemployedtodeterminethepotassiumcontentingeologicalsamplesaccuratelyandefficiently. Methodology: Thelowbackgroundgammaspectrometerusedinthisstudyconsistsofahigh-puritygermaniumdetector(HPGe)coupledwithalowbackgroundshield.Theshieldprovidesaneffectivemeansofreducingbackgroundradiationfromexternalsources,enablingthedetectionoflow-energygammaraysemittedbypotassium-40(^40K),theprimaryisotopeofinterestforpotassiummeasurements. Thesampleswerepreparedbycrushingandgrindingthegeologicalmaterialstoobtainahomogeneouspowder.Approximately200mgofpowderedsamplewasthencarefullyweighedandplacedintoacylindricalaluminumcontainer.Thesecontainersweretheninsertedintoadetectorshield,ensuringproperpositioningandminimalinterferencefromexternalradiation. Thegammaspectrometerwascalibratedusingcertifiedreferencematerialswithknownpotassiumcontent.Amultichannelanalyzer(MCA)recordedthegammaenergyspectra,whichwereanalyzedusingdedicatedsoftware.Thepeakareacorrespondingtothegammaemissionof^40Kat1.46MeVwascomparedtothecalibrationcurvetodeterminethepotassiumconcentrationinthesamples. ResultsandDiscussion: Thedevelopedmethodwassuccessfullyappliedtodeterminethepotassiumcontentinarangeofgeologicalsamples,includingrocks,minerals,andsediments.Thelowbackgroundgammaspectrometerexhibitedhighsensitivitywithlowdetectionlimits,makingitsuitableforsampleswithinherentlylowpotassiumcontent. Theobtainedpotassiumconcentrationsrangedfromafewhundredppmtoseveralpercent.Theseresultswereconsistentwiththeexpectedvaluesforthedifferentgeologicalsamples,furtherva