新疆核试验场周围地区主要食品中^(90)Sr(锶)、^(137)Cs(铯)水平及其所致居民剂量

The Level of 90Sr and 137Cs Around The Nuclear Testing Site in Xinjiang and The Residents' Dose Caused from Them

本文报道了新疆核试验场周围地区9个调查区17种主要食品中^(90)Sr、^(137)Cs含量分别为1.1～72.3,0.3～40.7×10^(-2)B_q·Kg^(-1);3个对照区分别为1.6～68.4,0.6～27.4×10^(-2)B_q·K_g^(-1)。两地区同类食品中^(90)Sr、^(137)Cs平均含量基本一致。调查区^(90)Sr、^(137)Cs所致成年居民有效剂量当量值分别为2μSV(集体剂量当量为30.0人· SV);0.3μSV(4.5人· SV)。对照区分别为2.2μSV(集体剂量当量为20.9人·SV);0.4μSV(3.0人·SV)。可见我国核试验产生的^(90)Sr、^(137)Cs对核试验场周围地区食品没有造成明显的局部污染,所致居民剂量当量负担仅为我国天然外照射所致年有效剂量当量(952μSV)的0.2％和0.03％。对该地区的广大居民健康不会产生有害的影响。

Around the nuclear testing site in Xinjiang, the 90Sr and 137 Cs content of 17 kinds of main food respectively were 1.1 -72.3 and 0.3 -40.7×10-2Bq/kg in 9 investigation areas; they respectively were 1.6 -68 .4and 0.6 -27 .4×10-2Bq/kg in 3 control areas. The 90Sr and 137Cs average content of the same kinds of food in the two areas were nearly corresponding. In the investigation areas, the adult residents' effective dose equivalent caused from 90Sr and 137Cs respectively were 2 μSV(the collective dose equivalent was 30 .Operson. SV) and 0. 3 μSV(4. 5 person.SV); in the control areas, they respectively were 2. 2 μSV (the collective dose equivalent was 20 .9person.SV) and 0. 4 μSV(3. 0 person.SV). To all appearance, 90Sr and 137Cs prodiced from our nuclear test didn't obviously contaminated food in the areas around the nuclear testing site, the residents' dose equivalent caused from them respectively were 0. 2% and 0. 03% of the annual effective dose equivalent(952 μSV) caused from our natural external radioactivity. That is they didn' t really affect the residents health in this areas.