台湾地区哺乳动物甲状腺中的碘-129浓度。

129I concentrations of mammalian thyroids in Taiwan.

作者信息

Chao J H, Tseng C L

机构信息

Nuclear Science and Technology Development Center, National Tsing Hua University, Taiwan, ROC.

出版信息

Sci Total Environ. 1996 Dec 20;193(2):111-9. doi: 10.1016/s0048-9697(96)05327-2.

DOI:10.1016/s0048-9697(96)05327-2

PMID:9043144

Abstract

The 129I and 129I/127I ratios in mammalian thyroids were determined by neutron activation analysis to estimate the 129I concentrations in the biosphere due to fallout accumulation during the past decades in this island. The average 129I/127I ratio in thyroids of grazing animals, bovine and ovine, is about 1 x 10(-9), three times higher than that of hogs. The 129I/127I ratio in twin water collected during the same period was found to be as high as 1.7 x 10(-8) and it is supposed to be the predominant source of 129I in the biosphere. The 129I concentrations in these mammalian thyroids are similar to those of non-direct contamination areas of the world, where the terrestrial 129I contents are influenced by the global fallout.

摘要

通过中子活化分析测定了该岛屿哺乳动物甲状腺中的129I及129I/127I比值，以估算过去几十年由于沉降物积累在生物圈中形成的129I浓度。放牧动物（牛和羊）甲状腺中的平均129I/127I比值约为1×10^(-9)，是猪的三倍。同期采集的双份水样中的129I/127I比值高达1.7×10^(-8)，被认为是生物圈中129I的主要来源。这些哺乳动物甲状腺中的129I浓度与世界非直接污染地区的浓度相似，在这些地区，陆地129I含量受全球沉降物影响。