【摘要】 本文介绍我们实验室用ＨｐＧｅγ谱仪对研制的河泥标准物质中￣（２３８）Ｕ、￣（２３５）Ｕ、￣（２２６）Ｒａ、￣（２３２）Ｔｈ、￣（４０）Ｋ、￣（６０）Ｃｏ和￣（１３７）Ｃｓ７种放射性核素进行定值测量的方法和结果。由于对谱仪效率进行了精密的刻度，测量中作了符合相加和干扰峰修正，采用了全峰面积法和函数拟合法两种峰分析方法，以及使用了尽可能多的特征γ射线所得的结果，提高了测量的精确性和可靠性。对７种核素，本测量与河泥标准物质（多个实验室）定值结果的相对偏差在＋１．０——６．５％之间，都在或误差范围内符合。更多还原

【Abstract】 ln this paper described were the method and results for determination of sevel1 ra- dionuclides:￣(238)U,￣(235)U,￣(226)Ra,￣(232)Th,￣(40)K,￣(60)Co and ￣(137)Cs in the river sediment CertifiedReferance Material(CRM)using a HpGe gamma- ray spectrometer.The accuracy and reliability of measurement results were improved through variaties of techniques,which include:precise calibration of the gamma-ray spectrometer,coincidence summing correction and interference peak correction,two kinds of peak analysis methods(TPA and function fit),andutilization of as many as possible characteristic gamma- rays. Present measurement resultsfor the seven radionuclides were in agreement with the verification results of the CRM withl or 2 uncertainty,and its relative deviation were in the range of +l.0% 6.5%.更多还原