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| Fractional Absorption in Gastrointestinal Tract of 232Th by Ingestion for Chinese Man |
| LIU Qing-fen and ZHU Hong-da |
| Institute of Radiation Medicine, Chinese Academy of Medical Sciences and Bei jing Union Medicine College, Tianjin 300192, China |
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Abstract Objective To estimate fractional absorption in gastrointestinal tract (f1) of 232Th by ingestion for the Chinese male adults.Methods According to f1 calculation method in literature and results of Th concentrations in dietary foods and organ or tissues for the Chinese male abults, obtained in recent years, f1 values were estimated from the median and mean Th concentrations and compared each other.Results The f1 value from the median and mean Th concentrations was 0.000 48 and 0.000 28 respectively.Conclusion The f1 of 232Th by ingestion for the Chinese male adults should be adopted as 0.000 48, being lower than estimated result from the world reference concentrations in UNSCEAR 2000 Report, but quite near to the relevant reported value from Asian countries, such as India or Japan, and supporting the latest recommended value 0.000 5 by ICRP too.
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Received: 12 January 2003
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