长治市建筑主体材料天然放射性水平

Natural Radioactivity Level of Main Building Materials in Changzhi

采用低本底多道γ能谱仪对长治市建筑主体材料中天然放射性核素226Ra、232Th和40K的比活度进行检测,并按照相关标准方法进行评价。结果表明,长治市建筑主体材料的天然放射性核素226Ra、232Th、40K的比活度分别为14.58～131.18、9.92～138.77和96.11～818.99 Bq/kg。建筑主体材料的内、外照射指数分别为0.09～0.58和0.13～0.80,均小于1,其使用不受限制。这些建筑主体材料用于房屋建筑,空心砖及碎石所致居民年有效剂量最高,大于欧洲委员会EU提出的1 mSv/y。

The activity concentrations of natural radionuclides^226Ra、^232Th、^40K in main building materials in Changzhi was determined by using low - background gamma - ray spectrometry and their radiation hazards were evaluated according to the standard methods. The results show that the activity concentrations of ^226Ra、^232Th、and ^40Kin main building materials range from 14.58 - 131.18, 9.92 - 138.77 and 96.11 - 818.99 Bq/kg, respectively. The internal and external exposure index of main building materials range from 0. 09 - 0.58 and 0.13 -0.80, respectively, which are all less than 1. The studied building materials can be used anywhere with no any restriction. The annual effective doses of hollow brick and gravel aggregate are higher than the upper limit of 1 mSv/y suggested by European Commission in 1999.