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由于天然候选物土壤标准物质放射性核素的含量较低,绝对测量较困难,因此采用多家实验室比对方法进行定值。比对路线为星形,即主导实验室将比对样品通过快递邮寄到各参比实验室,各实验室测量结束后将可回收样品寄回主导实验室,并将处理完的测量结果按照规定格式报给主导实验室。比对样品分为两组。第1组样品包含可通过γ谱方法定值的~(40)K、~(50)Co、~(137)Cs、~(226)Ra、~(232)Th、~(235)U、~(238)U和~(241)Am等核
Due to the low content of radionuclides of natural candidate soil standard material, absolute measurement is more difficult, therefore, a number of laboratory comparison methods are used for setting values. Alignment route is star, that is, the leading laboratory will compare the sample by express mail to the reference laboratory, after the completion of the measurement of the laboratory will return the sample to the leading laboratory, and the finished measurement results in accordance with the provisions of Format reported to the leading laboratory. The samples were divided into two groups. The first set of samples contained ~ (40) K, ~ (50) Co, ~ (137) Cs, ~ (226) Ra, ~ 232 Th, ~ 235 U, (238) U and ~ (241) Am nuclei