科研之友
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摘要
Concentrations of natural radionuclides Ra-226, Th-232, K-40 and man-made Cs-137 in most important tourist Gran Canaria beaches have been determined using a high-purity Germanium detector to analyse their radiological hazard. Average values of the activity concentrations of Ra-226, Th-232 and K-40 were 17.61.4, 21.31.8 and 48022 Bq kg(1), respectively. Observed activity concentration values of Cs-137 were practically negligible from a radiological protection point of view. The results of this paper were compared with others published in the bibliography for beaches and coastal sediments of different countries. The mean external air absorbed dose rate was 43.92.8 nGyh(1), which resulted in an outdoor annual effective dose below the world average. Also, the radium equivalent and the external hazard index were calculated. Results from Gran Canaria beaches showed the low levels of radioactivity, indicating no significant radiological risk related to human activities in the area.
- 出版日期2013-8
