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Radiation Protection Dosimetry Advance Access originally published online on October 19, 2004
Radiation Protection Dosimetry 2004 112(3):395-404; doi:10.1093/rpd/nch408
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Radiation Protection Dosimetry Vol. 112, No. 3 © Oxford University Press 2004; all rights reserved

Human metabolism of radiocaesium revisited

C. L. Rääf1,*, R. Falk2, C. Thornberg1, M. Zakaria1 and S. Mattsson1

1 Department of Radiation Physics, Lund University, Malmö University Hospital, SE-205 02 Malmö, Sweden
2 Swedish Radiation Protection Authority, SE-171 16 Stockholm, Sweden

* Corresponding author: Christopher.Raaf{at}rfa.mas.lu

Three adult volunteers (2 males and 1 female) have ingested radioactive caesium in two edible forms in order to compare the gastrointestinal uptake and the subsequent short-term and long-term biokinetics. Foodstuffs made of fresh-water fish or mushrooms from regions in Sweden of high 137Cs deposition was ingested together with a 134CsCl-solution mixed with soft drinks. Whole-body countings of 134Cs and 137Cs were performed in the Malmö whole-body counter during a period of ~50 d prior to, and 200–300 d after the ingestion. Urine and faeces were collected the day before and up to 7–10 d after the test meals, and analysed for 134Cs and 137Cs. No significant difference in the gastrointestinal uptake fraction, f0 = 0.98, between caesium incorporated into a foodstuff matrix and caesium in ionic form was detected. Cumulated faecal excretion during 7 d after ingestion accounted for 2–3% of the intake. No significant difference in the long-term biological half-time was found between caesium present in a food matrix and in an aqueous solution in any of the volunteers.


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