Methodology for determination of correction factors in direct gamma spectrometric measurement of radionuclides in sediments-中国Betway体育网页登陆

摘要 Inthisstudy,thepracticalmethodologiesaredescribedforthedeterminationofthefactorsfortheselfabsorptioneffect(Fs),spectralinterferences(Fcsi),andtruecoincidencesummingeffects(Fcoi),whichareusedindirectgamma-spectrometricmeasurementofradionuclidessuchas210Pb,238U,234Th,226Ra,214Pb,228Ac,208Tl,214Bi,137Csand40Kinsamples.Tovalidatetheappliedmethods,certifiedreferencematerials(CRMs)oflakeandstreamsedimentsweremeasuredwithann-typeGermanium(Ge)detector-calibratedusingamultinuclidereferencesource.Thehighestself-absorptioncorrectionfactorsrangedfromFs1.44-2.10for46.5keVpeak(210Pb)andFs?1.25-1.60for63.3keVpeak(234Th)lyinginthelowenergyregionofthespectrum.Thesystematicinfluencewasobservedfor186.2keV(226Ra)peakduetospectralinterferenceswiththe235Ucontribution.Forthispeak,Fcsiischangedfrom0.921to0.955.Additionally,thepresentstudysuggeststhattruecoincidencesumming(TCS)effectsarenotdominant,exceptfor208Tland214BiforwhichFcoirangedfrom1.179to1.192anrangedfrom1.140to1.151,respectively.

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Methodology for determination of correction factors in direct gamma spectrometric measurement of radionuclides in sediments

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