陕西省榆林地区环境陆地γ辐射剂量水平调查

INVESTIGATION OF ENVIRONMENTAL TERRESTRIAL GAMMA-RADIATION LEVEL IN YULIN OF SHANXI PROVINCE

本文报道了1986年榆林地区环境陆地γ辐射水平的调查结果。全区大致按面积均匀布设了82个网格点;原野、道路和室内的γ辐射空气吸收剂量率按测点加权均值分别为5.26、5.25和8.61×10^(-(?))Gy·h^(-1),变化范围分别为(3.26—7.94)、(3.021—7.049)和(5.70—11.95)×10^(-3)Gy·h^(-1)。各道路与原野和室内与原野的天然γ辐射剂量率比值之算术平均值分别为1.01和1.70;变化范围分别为(0.75—1.47)和(0.93—2.61)。全区原野、道路和室内天然贯穿辐射剂量率(包括宇宙射线贡献在内)的算术均值分别为9.97、9.96和12.14×10^(-8)Gy·h^(-1),变化范围分别为(8.16—11.99)、(7.97—11.94)、(9.32—16.28)×10^(-8)Gy·h^(-1)、全区由天然贯穿辐射所致人均年有效剂量当量和集体年有效剂量当量分别为816μSv 和2.06×10~3人·Sv。

This paper describes the results of investigatio of enviro-nmental terrestrial γ-radiation level at Yulin area in,1986.82 net gridpoints were arranged in the area homogeneously and γ-radiation air absorbed dose rate were measured in the field.on the road and indoors at all points.The arithmetic means by the area weighted for there dose rate were 5.26,5.25 and 8.61×10^(-8)Gy/h,with the ranges of(3.26—7.94),(3.21—7.49)and(5.70—11.95)×10^(-8)Gy/h respectively.The arithmetic means of theratios for the dose rate of natural γ-radiation on the road and indoors tothat in the field at each point were 1.01 and 1.70 with the ranges of(0.75—1.47)and(0.93—2.61)respectively.The arithmetic means for naturalpenetrating inclnding the contriluction from cosmic rays radiation dose ratein the field on the road and indoors were 9.97,9.96 and 12.14×10^(-8)Gy/hwith the ranges of(8.16—11.99),(7.97—11.94),(9.32—16.28)×10^(-8)Gy/h,respectively.Annual average individual effective dose equivalentand annual collective effective dose equivalent caused from natural penetr-ating radiation were 816 μSv and 2.06×10~3 man·Sv respectively.