建筑材料中天然放射性的γ能谱分析

The natural radioactivity measurement in building materials by γ ray spectrometry

应用HPGeγ谱仪对一批建筑材料中226Ra、232Th和40K的放射性比活度进行了测定。结果表明,根据GB6566-2001《建筑材料放射核素限量》,其内照射指数IRa和外照射指数Ir(除2#、3#样品外)均达国家标准限制要求,可作为建筑主体材料使用。根据放射性水平指数,皆属于A类装修材料。并计算了相关的年有效剂量当量。

The specific activities of some natural nuclides (()^(232)Th,()^(226)Ra and ()^(40)K) in 7 samples of building materials were measured using a HPGe γ spectrometer. Except samples No 2 and No 3, the internal and the external exposure index of other samples are within the required values as main materials for building according to the national standard GB 6566-2001. According to their radioactive levels, all samples belong to class A decorative materials. Besides, relative annual effective dose equivalents were also computerized.