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226Ra, 232Th and 40K activities in soils of Cuihua Mountain National Geological Park, China

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Environmental Geology

Abstract

Gamma activity from the naturally occurring radionuclides namely, 226Ra, 232Th, the primordial radionuclide 40K was measured in the soil of Cuihua Mountain National Geological Park, China using γ-ray spectrometry technique. The mean activity of 226Ra, 232Th and 40K were found to be 27.2 ± 6.5, 43.9 ± 6.2 and 653.1 ± 127.6 Bq kg−1, respectively. The concentrations of these radionuclides were compared with the typical world values and the average activities of Chinese soil. The radium equivalent activity, the air absorbed dose rate, the annual effective dose rate, and the external hazard index were evaluated and compared with the internationally approved values. All the soil samples have Raeq lower than the limit of 370 Bq kg−1 and H ex less than unity. The overall mean outdoor terrestrial gamma dose rate is 66.3 nGy h−1 and the corresponding outdoor annual effective dose is 0.081 mSv.

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Acknowledgments

This work was supported by the Program for New Century Excellent Talents in University under Grant NCET-05-0861 and the Provincial Natural Sciences Foundation of Shaanxi Province under Grant 2006D14. Gratitude is expressed to F. Wang and S. Ren for assisting in experimenting.

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  1. School of Tourism and Environment, Shaanxi Normal University, 710062, Xi’an, People’s Republic of China

    Xinwei Lu & Xiaolan Zhang

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  1. Xinwei Lu
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  2. Xiaolan Zhang
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Correspondence to Xinwei Lu.

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Lu, X., Zhang, X. 226Ra, 232Th and 40K activities in soils of Cuihua Mountain National Geological Park, China. Environ Geol 56, 353–357 (2008). https://doi.org/10.1007/s00254-007-1170-3

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