新疆环境天然贯穿辐射水平调查研究

SURVEY OF ENVIRONMENTAL NATURAL PENETRATING RADIATION LEVEL IN XINJIANG

报道了1984年～1989年新疆环境天然贯穿辐射剂量的调查方法及其结果.在全区海拔-154～ 5 300(米)的广大区域,布测点 1624个,含25×25(km)网格点740个,各类加密点 884个.结果表明:1.原野γ辐射剂量率的范围值,按网格、面积加权和人口加权的均值,依次分别是(1.17～32.64),5.81、5.76和 5.94(×10^(-8)Gy·h^(-1); 2.道路上γ辐射剂量率按网格的均值为 5.63×10^(-8)Gy·h^(-1);3.建筑物室内γ辐射剂量率按网格和人口加权的均值分别是9.92和 9.86(×10^(-8)Gy·h^(-1));4.宇宙射线电离成分所致空气吸收剂量率按网格和人口加权的均值,室外分别是4.40和 4.01(×10^(-8)Gy·h^(-1)).室内分别是3.90和3.55(×10^(-8)Gy·h^(-1));5.天然贯穿辐射剂量率(不包括中子成分)按网格和人口加权均值,室外分别是10.22和 9.77(×10^(-8)Gy·h^(-1))室内分别是13.82和13.42 (×10^(-8)Gy·h^(-1));6.天然贯穿辐射所致全区居民人均年有效剂量当量为857μSv.其中γ辐射和宇宙射线所致分别为535和 322μSv;所致居民年集体有效剂量当量为 11 207man·Sv;7.新疆属正常本底辐射水平地区,但局部区域原野γ辐射剂量率偏高(20～30×10^(-8)Gy·h^(-1)).

The paper reports the method and main results of investigation on environmental natural penetrating radiation levels in Xinjiang. There are 1624 measuring point, of which 740 were net grid measuring points with 25 × 25km, 884 dense ones. The results show that this levels of Xinjiang was belong to normal background level, but the range of natural y radiation dose rate over field is rather high (20~ 30 × 10-8Gy · h-1) in parts of this region.