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摘要
The concentration of natural radionuclides in commonly used building materials collected from Yan'an, China, was determined using gamma ray spectroscopy with a NaI(Tl) detector. The activity concentration of Ra-226, Th-232, and K-40 in the studied building materials ranges from 9.4-73.1, 11.5-86.9, and 258.9-1,055.1 Bq kg(-1), respectively. The concentrations for these natural radionuclides were compared with the reported data of other countries and the world mean values for soil. The radium equivalent activity (Ra-eq), external hazard index (H-ex), internal hazard index (H-in), indoor air absorbed dose rate, and annual effective dose rate due to natural radionuclides in samples were estimated to assess radiological hazards for people living in dwellings made of the studied building materials. The calculated Ra-eq values of all building materials (75.7-222.1 Bq kg(-1)) are lower than the limit of 370 Bq kg(-1). The values of H-ex and H-in are less than unity. The mean values of indoor air absorbed dose rates of all building materials (101.0 +/- 14.1-177.0 +/- 6.8 nGy h(-1)) are higher than the world population-weighted average of 84 nGy h(-1), while the mean values of annual effective dose range from 0.50 +/- 0.07-0.87 +/- 0.03 mSv y(-1), which are lower than the recommended limit of 1 mSv y(-1). It is found that these materials may be used safely as construction materials and do not pose significant radiation hazards to inhabitants. Health Phys. 104(3): 325-331; 2013
- 出版日期2013-3
- 单位中国科学院地球环境研究所; 陕西师范大学
