44·分析与应用·2023年第2期(总第166期)高纯锗γ能谱法测量伴生放射性矿稀土酸熔渣238U方法研究张会乔1,张若煊2,姚明2(1.中国核电工程有限公司,北京,100840;2.东华理工大学,江西南昌,330000)摘要:为降低高纯锗(HPGe)γ谱仪测量稀土酸溶废渣238U时基体自吸收效应产生的干扰,本文按比例将伴生放射性矿稀土酸熔渣样品与模拟土壤基体空白混合均匀,采用高纯锗(HPGe)γ谱仪对238U子体234Thγ射线(92.6keV)进行测量得到238U放射性比活度。伴生放射性矿稀土酸熔渣样品与模拟土壤基体样品按比例为40g:260g与50g:250g时测量结果与电感耦合等离子体质谱法(ICP-MS)和激光荧光法测量结果相符合,可知HPGeγ能谱法在伴生放射性矿稀土酸熔渣样品与模拟土壤基体样品按40g:260g与50g:250g比例混合时灵敏度最佳。本研究建立了HPGeγ能谱法测定伴生放射性矿稀土酸熔渣中238U的测定方法,填补当前伴生放射性矿样品238U测定方法的空白。关键词:高纯锗(HPGe)γ谱仪;模拟土壤基体空白;伴生放射性稀土酸熔渣;238U含量中图分类号:TL817.2;X837文献标志码:A文章编号:1008-3103(2023)02-0044-04HPGeγStudyontheMethodofMeasuring238URareEarthAcidSlagofAssociatedRadioactiveOrebyEnergySpectrumZhangHui-qiao1,ZhangRuo-xuan2,YaoMing2(1.ChinaNuclearPowerEngineeringCo,Beijing100840,China;2.EastChinaUniversityofTechnology,NanchangJiangxi330000,China)Abstract:ToreduceHPGeγThespectrometermeasurestheinterferencegeneratedbytheselfabsorptioneffectofthematrixwhentheacidsolublewasteresidueofrareearth238Uisused.Therareearthacidslagsampleoftheassociatedradioactiveoreismixedevenlywiththeblankofthesimulatedsoilmatrixinproportion,andthehigh-puritygermanium(HPGe)isusedγSpectrometerto238Udaughter234ThγThespecificactivityof238UwasmeasuredbyX-ray(92.6keV).Themeasurementresultsoftherareearthacidslagsampleofassociatedradioactiveoreandthesimulatedsoilmatrixsampleattheratioof40g:260gand50g:250gareconsistentwiththemeasurementresultsofinductivelycoupledplasmamassspectrometry(ICP-MS)andlaserfluorescence.ItisknownthatHPGeγThesensitivityoftheenergyspectrummethodisthebestwhentherareearthacidslagsampleofassociatedradioactiveoreismixedwiththesimulate...