| Zhao Shuquan.Fission track analysis method of urine plutonium and estimation of plutonium-239 internal dose to Marshallese[J].Chinese Journal of Radiological Medicine and Protection,1995,15(4):237-242 |
| Fission track analysis method of urine plutonium and estimation of plutonium-239 internal dose to Marshallese |
| Received:November 17, 1994 Revised:May 04, 1995 |
| DOI： |
| KeyWords:Marshall Islands Bravo fallout plutonium urinalysis fission track analysis |
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| Abstract:: |
| Bravo detonated at Bikini Atoll on the morning of March 1, 1954,unexpectedly released a large amount of radioactive fallout on the areas.Impact studies on the radiological health and safety of the residents living in the contaminated environments are still undergoing. For plutonium dose assessment.researchers at Brookhaven National Laboratory established a fission track analysis (FTA) method for low-level 239Pu measurement. Furthermore, a new shipboard protocol was developed for collecting 24-h radiologically clean urine sampies. The purposes of this paper are to update information on the FTA processes and to present a set of results on the 239Pu measurements in the Marshallese populations (Rongelap and Utirik) between 1981-1991. The detection sensitivity of FTA method(99% confidence level)in these samples was 2-3 μBq which is equivalent to 0.2-0.3 mSv effective dose equivalent (EDE) to age 70 for the Marshallese.The latest 1991 FTA data indicate average EDE of 0.62mSv and 1.6 mSv for the people of Rongelap and Utirik, respectively, which both are the highest values since 1988. |
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