NATURAL RADIONUCLIDE DISTRIBUTION IN SOILS OF CACERES (SPAIN) - DOSIMETRY IMPLICATIONS

被引：29

作者：

BAEZA, A

DELRIO, M

MIRO, C

PANIAGUA, J

机构：

[1] Department of Physics, Faculty of Veterinary, Extremadura University

来源：

JOURNAL OF ENVIRONMENTAL RADIOACTIVITY | 1994年 / 23卷 / 01期

关键词：

D O I：

10.1016/0265-931X(94)90503-7

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Levels of exposure to natural radiation have been calculated from the concentrations of natural gamma-emitting radionuclides present in the soils of the province of Caceres (Spain). The objective was to estimate the external radiation dose received by the population as afunction of the place of residence, and then to draw the corresponding natural exposure rate map for the region under study. For this purpose, 263 soil samples were collected from points uniformly distributed throughout the geography of the zone. These were analysed using gamma spectrometry. The mean specific activities of Ra-226 , U-235, Th-232 and K-40 were 38.3, 3.06, 41.0 and 653 Bq kg-1 dry weight, respectively, and the isoactivity maps for each isotope showed that the greatest concentrations occurred in granitic zones. The average value of the outdoor absorbed dose rate in air was 56.6 nGy h-1, corresponding to an annual effective dose equivalent of 429 muSv. The range of these values is very broad, varying from a minimum of 9 nGy h-1 to a maximum of 8320 nGy h-1 in the vicinity of a uranium mine.

引用

页码：19 / 37

页数：19

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