Department of Physics, Faculty of Sciences, Central Tehran Azad University, Tehran, Islamic Republic of Iran.
Mar Pollut Bull. 2013 Sep 15;74(1):425-34. doi: 10.1016/j.marpolbul.2013.06.030. Epub 2013 Jul 11.
Radionuclides which present in different beach sands are sources of external exposure that contribute to the total radiation exposure of human. (226)Ra, (235)U, (232)Th, (40)K and (137)Cs analysis has been carried out in sand samples collected at six depth levels, from eight locations of the northern coast of Iran, Ramsar, using high-resolution gamma-ray spectroscopy. The average Specific activities of natural radionuclides viz., (226)Ra, (235)U, (232)Th, (40)K and (137)Cs, in the 0-36 cm depth sand were found as: 19.2±0.04, 2.67±0.17, 17.9±0.06, 337.5±0.61 and 3.35±0.12 Bq kg(-1), respectively. The effects of organic matter content and pH value of sand samples on the natural radionuclide levels were also investigated. Finally, the measured radionuclide concentrations in the Ramsar beach were compared with the world average values, as reported by UNSCEAR (2000). None of the studied beaches were considered as a radiological risk.
在不同海滩砂中存在的放射性核素是导致人体外照射的辐射源，也是人体总辐射照射的一部分。本研究使用高分辨率伽马能谱法，对伊朗北部拉什特市（Ramsar）的 8 个地点的 6 个深度采集的沙样中的（226）Ra、（235）U、（232）Th、（40）K 和（137）Cs 等天然放射性核素进行了分析。结果表明，0-36cm 深度的沙样中天然放射性核素的比活度分别为：（226）Ra 为 19.2±0.04Bqkg-1，（235）U 为 2.67±0.17Bqkg-1，（232）Th 为 17.9±0.06Bqkg-1，（40）K 为 337.5±0.61Bqkg-1，（137）Cs 为 3.35±0.12Bqkg-1。此外，还研究了沙样中有机质含量和 pH 值对天然放射性核素水平的影响。最后，将拉什特海滩的测量放射性核素浓度与 UNSCEAR（2000）报告的世界平均值进行了比较。研究中没有一个海滩被认为有放射性风险。
