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| Transfer of Lanthanides From Soil to Human Body and Their Distribution |
| LIU Qing-fen, ZHU Hong-da |
| Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Peking Union Medical College, Tianjin 300192, China |
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Abstract Objective To calculate the transfer coefficients of 14 lanthanides from soil via diet to human body and their distribution in 10 kinds of organ or tissue.Methods Based on the research Results on dietary intakes and burdens of these lanthanides in 10 kinds of organ or tissue, collected from 4 areas with different dietary types in China, and relevant elementary background values in Chinese soil, their transfer coefficients from soil via diet to critical organ or whole body were calculated by using UNSCEAR terrestrial transfer model.LREE/HREE was used as evaluation index for disagreement.Results The total transfer coefficient of these lanthanides from soil to diet and from diet to whole body accounted for 0.131 ga-1/gkg-1 and 0.176 g/ga-1 respectively.The transfer coefficient from diet to skeleton was one order of magnitude higher than that to liver.The LREE group a little enhanced in transfer from soil to diet.LREE tended to deposit in skeleton and HREE did in liver.The organ and tissue distribution showed that skeleton was the highest (36.5%) and then muscle, lung and liver in decreasing order.Conclusion The transfer coefficients and disagreement of 14 lanthanides from soil via diet to human body and their distribution in 10 kinds of organ or tissue are obtained, the result provides direct human bases for estimating internal doses of lanthanide radionuclides, developing related hygienic standards and biokinetic model as well parameters in radiation protection field and, also are of important significance for research in other extensive fields.
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Received: 10 November 2003
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