99TC/137CS ACTIVITY RATIOS IN RAINWATER SAMPLES COLLECTED IN THE SOUTH OF SPAIN

被引：24
作者：
GARCIALEON, M
MANJON, G
SANCHEZANGULO, CL
机构：
[1] Facultad de Física, Universidad de Sevilla, 41080 Sevilla
来源：
JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 1993年 / 20卷 / 01期
关键词：
Atmospheric radioactivity - Cesium - Mathematical models - Radioisotopes - Technetium - Water pollution;
D O I：
10.1016/0265-931X(93)90018-3
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The presence of Tc-99 and Cs-137 in rainwater samples collected from 1984 to 1988 in the south of Spain has been studied. A simple model has allowed the description of the time evolution of the Tc-99/Cs-137 activity ratio. The calculated Tc-99 stratospheric residence time, 1.62 +/- 0.21 year, shows that the atmospheric behaviour of such a radionuclide is similar to that of other fission products. However, it could explain at the same time, the anomalous Tc-99/Cs-137 activity ratios obtained so far in the atmosphere. On the other hand, the appearance of Chernobyl-derived Cs-137 activities in the south of Spain has been shown.
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页码：49 / 61
页数：13
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