title: Human metabolism of radiocaesium revisited.
abstract: 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 Malmo whole-body counter during a period of approximately 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.
authors.affiliation: Department of Radiation Physics, Lund University, Malmö University Hospital, SE-205 02 Malmö, Sweden. Christopher.Raaf@rfa.mas.lu
authors.forename: C L
authors.initials: CL
authors.lastname: Rääf
authors.forename: R
authors.initials: R
authors.lastname: Falk
authors.forename: C
authors.initials: C
authors.lastname: Thornberg
authors.forename: M
authors.initials: M
authors.lastname: Zakaria
authors.forename: S
authors.initials: S
authors.lastname: Mattsson
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000818:Animals; D002586:Cesium / Q000494:pharmacology; D002588:Cesium Radioisotopes / Q000378:metabolism* / Q000493:pharmacokinetics*; D002712:Chlorides / Q000494:pharmacology; D005260:Female; D005399:Fishes; D041981:Gastrointestinal Tract / Q000528:radiation effects*; D006801:Humans; D007477:Ions; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D013997:Time Factors
chemical_list: D002588:Cesium Radioisotopes; D002712:Chlorides; D007477:Ions; D002586:Cesium; C028019:cesium chloride