Reconstructing the history of 14C discharges from Sellafield
Reconstructing the history of 14C discharges from Sellafield
复制标题
重建塞拉菲尔德 14C 放电的历史
DOI：
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发表时间：
2004
影响因子：
2.3
通讯作者：
P. Naysmith
中科院分区：
文献类型：
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作者：
G. Cook;E. Scott;A. B. Mackenzie;F. H. Naysmith;K. Isogai;P. Kershaw;R. Anderson;P. Naysmith
在1984年之前，报告的塞拉菲尔德海洋14 C排放量是估计值：1952年至1969年每年0.2 TBq，1984年开始测量之前每年1 TBq。在每年收集的紫菜（紫菜）海藻样品和年度排放量（估计和测量）的净过剩14 C活性之间的关系意味着排放量并不恒定的估计。根据1984年后的实测排放量与海藻中过量14C之间的关系，使用两个简单的经验模型重新计算了1967年至1984年的排放量。对海藻的伽马能谱测量还表明，紫菜是其他放射性核素排放变化的敏感指标，这是塞拉菲尔德采用新的废物清理技术造成的。
Prior to 1984, the reported marine 14C discharges from Sellafield were estimates: 0.2 TBq per annum from 1952 to 1969 and 1 TBq per annum until 1984 when measurements commenced. The relationship between the net excess 14C activity in annually collected Nori (Porphyra umbilicalis) seaweed samples and the annual discharges (estimated and measured) implies that the discharges were not as constant as the estimates. Based on the relationship between post-1984 measured discharges and the excess 14C in the seaweed, two simple empirical models were used to re-calculate the discharges between 1967 and 1984. Gamma-spectrometry measurements on the seaweed also indicate that Porphyra is a sensitive indicator of changes in discharge of other radionuclides, brought about by the introduction of new waste clean-up technologies within Sellafield.