Maharana Mandakini, Krishnan Narayani, Sengupta D
Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur, West Bengal, India.
J Med Phys. 2010 Oct;35(4):235-41. doi: 10.4103/0971-6203.71762.
The concentrations of natural radionuclides in surface soil samples around selected villages of Jaduguda were investigated and compared with the radioactivity level in the region. Concentrations of (238)U, (232)Th, and (40)K were determined by a gamma ray spectrometer using the HPGe detector with 50% relative efficiency, and the radiation dose to the local population was estimated. The average estimated activity concentrations of (238)U, (232)Th, and (40)K in the surface soil were 53.8, 44.2 and 464.2 Bq kg(-1) respectively. The average absorbed dose rate in the study area was estimated to be 72.5 nGy h-1, where as the annual effective dose to the population was 0.09 mSv y-1. A correlation analysis was made between measured dose rate and individual radionuclides, in order to delineate the contribution of the respective nuclides towards dose rate. The radio-elemental concentrations of uranium, thorium and potassium estimated for the soils, in the study area, indicated the enrichment of uranium series nuclide. The results of the present study were subsequently compared with international and national recommended values.
对贾杜古达选定村庄周围表层土壤样本中的天然放射性核素浓度进行了调查，并与该地区的放射性水平进行了比较。使用相对效率为50%的HPGe探测器，通过伽马射线光谱仪测定了²³⁸U、²³²Th和⁴⁰K的浓度，并估算了当地居民的辐射剂量。表层土壤中²³⁸U、²³²Th和⁴⁰K的平均估算活度浓度分别为53.8、44.2和464.2 Bq kg⁻¹。研究区域的平均吸收剂量率估计为72.5 nGy h⁻¹，而人群的年有效剂量为0.09 mSv y⁻¹。对测量的剂量率与单个放射性核素进行了相关性分析，以确定各核素对剂量率的贡献。研究区域土壤中估算的铀、钍和钾的放射性元素浓度表明铀系核素存在富集。随后将本研究结果与国际和国家推荐值进行了比较。
