【摘要】 本文介绍用Φ100×100NaI(Tl)γ谱仪测定地层γ辐射中铀系、钍系和钾-40三种成分各自的照射量率贡献的逆矩阵法。谱仪用标准模型源进行刻度。对不同类型的环境辐射场进行了测量,并与高压电离室的测量值进行了比较,结果在±10%以内符合。文中还对方法的原理、刻度和测量中存在的一些问题进行了讨论。更多还原

【Abstract】 This paper describes a inverse matrix method for measuringindividual exposure rate from ²³⁸U series,²³²Th series and ⁴⁰K of environ-mental gamma Radiation by a φ100×100 NaI（Tl）γ spectrometer.The spectr-ometer was calibrated with a set of standard geologic formations.Variouskinds of environmental gamma radiation fields were measured with the spec-trometer and a high pressure ionization chamber.The results are in agree-ment within ±10%.Some problems relating its principle,calibration andmeasurment are also discussed.更多还原