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Determination of U and Th in soil and plants obtained from a high natural radiation area in China using ICP-MS and γ-counting |
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| Authors: | M Yukawa Y Watanabe Y Nishimura Y Guo Z Yongru H Lu W Zhang L Wei and Z Tao |
| Institution: | (1) Division of Human Radiation Environment, National Institute of Radiological Sciences, 9-4, Anagawa-4-chome, Inage-ku, Chiba-shi, 263-8555 Japan, JP;(2) Guangdong Institute of Radiation Hygiene and Protection, 68 Haikang Street, Xingangxi Road, Guangzhou, 510310 China, CN;(3) Laboratory of Industrial Hygiene, Ministry of Health, 2 Xinkang Street, Deshengmenwai, Beijing, 100088 China, CN |
| Abstract: | This study was carried out for the determination of 238U and 232Th concentrations in soil and various foods obtained in high natural radiation areas in China for estimating the internal radiation doses caused by these radionuclides. Knowledge of the daily dietary intakes of the nuclides through foods is essential to evaluate the internal radiation dose. Several analytical methods were evaluated for their applicability and quality assurance. The accuracy and precision of ICP-MS is considerably better for determining trace elements like U and Th in fine powder samples. The estimated annual effective dose is 0.302 μ Sv/y for 238U and 1.86 μ Sv/y for 232Th in the high natural radiation area, and 0.0101 μ Sv/y for 238U and 0.177 μ Sv/y for 232Th in the control area. Received: 25 September 1998 / Revised: 3 December 1998 / Accepted: 8 December 1998 |
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