摘要
报道了中国原子能科学研究院内46—戊,503,146工号附近及院周围10km范围内土壤中(241) ̄Am含量;测定了院周围农村所产12种农作物中(241) ̄Am浓度以及(241) ̄Am从土壤经由植物根系向植物体的转移系数。调查表明,院内这三个处理超钚核素工号的正常运行没有对周围环境造成可觉察的(241) ̄Am污染。院周围10km范围内土壤中(241) ̄Am浓度为43±14mBq·kg ̄(-1),属全球性放射性落下灰所致环境本底水平。院周围农村所产作物中(241) ̄Am的含量范围为0.042-0.94mBq·kg ̄(-1)(鲜重);(241) ̄Am从土壤向这些作物的转移系数为6.2×l0 ̄(-4)—5.I×I0 ̄(-3)。
The contents of(24 1) ̄Am in soil , some species of vegetable and corn are measured. These specimensare collected in the vicinity to fuel reprocessing laboratory,(24 1) ̄ Am-Be neutron source producing labora-tories of CIAE and.from villeages around CIAE , respectively. Results investigated show that no observ-able environmental contamination of(241) ̄ Am could be detected during all the three laboratories in CLAEinvolved in handling(241) ̄ Am in normal operation. In the area within 1 0 km from CIAE , the averageconcentration of(241) ̄Am in soil is 43±14 mBq·kg ̄(-1)(dry). On this basis, a conclusion could be de-duced that this value is due to the environmental background as a result of worldwide fallout. The con-centration of(241) ̄Am in 12 species of vegetable and corn range from 0. 04 to 0. 94 mB·kg ̄(-1)(fresh),and the transfer factors of(241) ̄Am from soil to plant by root uptake range from 6.2×10 ̄(-4)to 5.1×10 ̄(-3). The distribution of(241) ̄Am in soil profiles showed that more than 74%of deposited(241) ̄Am has re-mained in the uppermost layer of soil of 0 5cm onsite.
出处
《同位素》
CAS
北大核心
1994年第2期86-91,共6页
Journal of Isotopes