Outcome of IAEA-RCA Reference Asian Man CRP (2nd Phase, 1995-1999) in Radiological Protection

Abstract

Ingestion and organ content of stable isotopes of ¹³⁷ Cs, ⁹⁰ Sr and ¹³¹I, and ²³⁸U and ²³²Th, and K and Ca, chemically similar to Cs and Sr, were studied to obtain representative values for the adult in each participating country and in the Asian region. Diet samples from 9 countries and tissue samples from 4 were analyzed under the QC provided by IAEA and the regional central reference laboratory. Selected NIST reference materials, and Typical Japanese Diet newly developed for the project were characterized. The data were compiled and analyzed by CRL and IAEA. The obtained results are (1) ingestion intake, (2) organ content of these elements and nuclides, and (3) internal dose estimates for ²³⁸U and ²³²Th in the region. Out of 220 diet samples, 1160 determinations were obtained by use of RNAA, ICP-MS, ICP-AES, etc. Intakes of I, Th, U and Sr/Ca ratios showed characteristic tendencies when compared with ICRP Reference Man. The results support a use of ICRP metabolic models for the environmental dose assessment. An IAEA-TECDOC and scientific papers are being published.