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用Ge(Li)γ谱仪测定安徽省凤台地区35个点的土壤样品,天然放射性核素的比活度分别为:~(225)Ra,31.00～49.63Bq.kg~(-1);~(223)Th,52.98～69.09Bq.kg~(-1);~(40)K,498.d～737.0Bq.kg~(-1)。rpv UNSCEAR 报告所估算的单位放射性活度离地面1m 处空气中吸收剂量率所计算的总的吸收剂量率为:81.0±5.2×10~(-10)Gy·h~(-1)。由此算得室外年有效剂量当量为99.3μSv 此值比UNCEAR 所估算的室外陆地外照射的年有效剂量当量70μSv 高42%。但与全国估算的均值相同。
The soil samples of 35 spots in Fengtai area of Anhui Province were measured by Ge (Li) γ spectrometer. The specific activity of natural radionuclides was ~ (225) Ra, 31.00 ~ 49.63 Bq · kg -1, respectively. ~ (223) Th, 52.98 ~ 69.09Bq.kg ~ (-1); ~ (40) K, 498.d ~ 737.0Bq.kg ~ (-1). The calculated total absorbed dose rate for the airborne dose rate at 1 m from the surface of the unit estimated by the rpv UNSCEAR report is: 81.0 ± 5.2 × 10 -10 Gy · h -1. This yields an outdoor annual effective dose equivalent of 99.3 μSv, which is 42% greater than the annual effective dose equivalent 70 μSv of outdoor terrestrial radiation UNCEAR estimates. But the same as the national average.