无源效率刻度在建筑材料放射性测量中的应用研究

Application of source-less efficiency calibration in radioactive measurement of building materials

利用蒙特卡罗方法对低本底NaI γ谱仪进行无源效率刻度,应用于建筑主体材料放射性测量中。根据国家标准对建筑材料的放射性进行评价,结果表明建筑主体材料^(226)Ra、^(40)K和^(232)Th比活度范围分别为7.15~23.86、285.11~822.76和13.58~49.51Bq/kg,其所致居民年有效剂量当量小于国家标准规定1 mSv/a,利用蒙特卡罗模拟效率刻度可以方便快捷给出NaI全能谱探测效率值。

Source-less efficiency calibration is applied of NaI γ spectrometer efficiency using Monte Carlo method in this paper,which can measure radioactive of building materials.According to the national standard,the radioactivity of building materials was evaluated.The results showed that the specific activity ranges of 226^Ra,40^K and 232^Th were 7.15~23.86,285.11~822.76 and 13.58~49.51 Bq/kg,respectively.The effective dose equivalent national standard provides 1mSv/a,in addition,Monte Carlo simulation efficiency calibration can be quickly and easily give NaI all-round spectrum detection efficiency value.