广西装饰建材放射性水平及致居民剂量

Radioactive levels of decorative building materials from Guangxi and their radiation dose to residents

目的 调查广西装饰建材的放射性水平 ,估算其用于居室装饰致居民剂量。方法 于广西较具规模的装饰建材厂采集了 8类 89个装饰建材样品 ,以γ能谱或放射化学分析法测定其2 2 6 Ra、2 32 Th和 40 K含量 ;采用这三种核素含量估算装饰建材用于室内装饰致室内居民剂量。结果 花岗岩放射性水平较高 ,其致居民内照射年有效剂量当量附加值已超 1mSv的国家标准限值 ,仅有 47%的品种可用于室内装饰 ;其它类装饰建材与混合建材放射性水平相当或略低 ,其致居民内、外照射年有效剂量当量附加值未超出标准限值。结论 除部分花岗岩外 。

Objective To survey the radioactivity of decorative building materials and its radiation dose to the residents in Guangxi. Methods 89 samples of eight types of decorative building materials were gathered from some larger scale enterprises. And the contents of 236 Ra, 232 Th and 40 K of the samples were measured by NaI (Te) gamma spectrometer and radiochemical analyses. Radiation doses to room residents were estimated by the contents of the three kinds of nuclears used in room decorative building materials. Results The results showed that radioactive levels of granites were much higher and their extra values of annual effective equivalent dose of internal radiation to residents exceeded the national standard limit of 1 mSv, and only 47% of granites seemed to be suitable for room decoration; radioactive levels of other decorative building materials were at the same range or a little lower than mixed building materials and the extra values of annual effective equivalent dose of both internal and external radiation to residents did not exceed the national standard. Conclusion Except part of granites, decorative building materials from Guangxi might cause no harmful radioactive effect on residents when used in room decoration. Key words Decorative building materials; Radioactive; Effective equivalent doses