宝鸡燃煤电厂周围土壤中天然放射性水平调查研究

NATURAL RADIOACTIVITY IN SOIL AROUND BAOJI COAL-FIRED POWER PLANT

本文介绍了宝鸡燃煤电厂周围土壤中天然放射性核素^226Ra、^232Th和^40K比活度的调查测量结果。在距电厂1km、3km处和距电厂〈1km范围内各布设8个采样点，共24个采样点；在每个点上分0～25cm（A层）和25～50cm（B层）两层取样，共采集土壤样品48个。用NaI（TI）低本底γ谱仪分析测量土样中的天然放射性核素。简要分析了距电厂不同距离和不同深度土壤样品中的^226Ra、^232Th和^40K比活度水平，并将24个A层土壤样品中^226Ra、^232Th和^40K比活度平均值与陕西省和其他一些省、市、地区的土壤调查测量结果作了比较。对燃煤电厂周围土壤中天然放射性核素比活度分布特点进行了初步分析，结果表明，^226Ra的平均比活度A层高于B层，在距电厂1km处^232Th和^40K的平均比活度B层高于A层。

Based on systematic sampling of soil around the Baoji coal-fired power plant, the activity concentrations of the natural radionuelides ^226Ra,^232Th and ^40K were determined using γ-ray spectrometry. Each eight soil samples were collected within the range of 1 km of the plant, and at a distance of 1 and 3 km from the plant, respectively. Two layers of soil sample [ 0～25cm （ layer A）, 25cm～50cm （ layer B ） ] were collected at each location. The concentrations of these radionuclides are different horizontally and vertically. The measured specific activity of ^226Ra, ^232Th and ^40K were compared with the average activity of other cities in Shaanxi soil. The results show that ^226Ra concentrations in layer A were higher than those in layer B and concentrations of ^232Th and ^40K in layer B were greater than those in layer A in soil samples collected at 1 km.