Rautela B S, Yadav M, Bourai A A, Joshi V, Gusain G S, Ramola R C
Department of Physics, HNB Garhwal University, Badshahi Thaul Campus, Tehri Garhwal 249199, India.
Radiat Prot Dosimetry. 2012 Nov;152(1-3):58-61. doi: 10.1093/rpd/ncs187. Epub 2012 Aug 19.
Natural radiation is the largest contributor to the collective radiation dose of the world population. It is widely distributed in different geological formations such as soil, rocks, air and groundwater. In the present investigation, (226)Ra, (232)Th and (40)K were measured in soil samples of the Ukhimath region of Garhwal Himalaya, India using NaI(Tl) gamma-ray spectrometry. The activity concentrations of naturally occurring radionuclides (226)Ra, (232)Th and (40)K were found to vary from 38.4 ± 6.1 to 141.7 ± 11.9 Bq kg(-1) with an average of 80.5 Bq kg(-1), 57.0 ± 7.5 to 155.9 ± 12.4 Bq kg(-1) with an average of 118.9 Bq kg(-1) and 9.0 ± 3.0 to 672.8 ± 25.9 Bq kg(-1) with an average of 341 Bq kg(-1), respectively. The total absorbed gamma dose rate varies from 70.4 to 169.1 nGy h(-1) with an average of 123.4 nGy h(-1). This study is important to generate a baseline data of radiation exposure in the area. Health hazard effects due to natural radiation exposure are discussed in details.
天然辐射是全球人口集体辐射剂量的最大贡献者。它广泛分布于土壤、岩石、空气和地下水等不同地质构造中。在本研究中，使用碘化钠（铊）γ射线能谱仪对印度加瓦尔喜马拉雅地区乌基马斯地区的土壤样本中的镭-226、钍-232和钾-40进行了测量。天然存在的放射性核素镭-226、钍-232和钾-40的活度浓度分别在38.4±6.1至141.7±11.9贝克勒尔每千克之间变化，平均为80.5贝克勒尔每千克；在57.0±7.5至155.9±12.4贝克勒尔每千克之间变化，平均为118.9贝克勒尔每千克；在9.0±3.0至672.8±25.9贝克勒尔每千克之间变化，平均为341贝克勒尔每千克。总吸收γ剂量率在70.4至169.1纳戈瑞每小时之间变化，平均为123.4纳戈瑞每小时。本研究对于生成该地区辐射暴露的基线数据很重要。详细讨论了天然辐射暴露对健康的危害影响。
