title: The use of an in vitro technique to predict the absorption of dietary radiocaesium by sheep.
abstract: The validity of an in vitro extraction technique to predict the availability for absorption of radiocaesium in the sheep gut has been assessed. The technique (a 2-h extraction with caesium chloride) was found to be valid for sources with a low availability for transfer across the gut, but inappropriate for ionic radiocaesium or radiocaesium incorporated internally within herbage. For such radiocaesium sources, which have a high in vitro availability, no correlation was found between in vitro extraction and true absorption measurements. A true absorption value of 0.80 is recommended for these sources, although values for individual sheep in the range 0.60 to 1.00 should be expected.
mesh_terms: D000821:Animal Feed; D000818:Animals; D002586:Cesium / Q000008:administration & dosage / Q000493:pharmacokinetics; D002588:Cesium Radioisotopes / Q000008:administration & dosage / Q000032:analysis / Q000493:pharmacokinetics*; D002712:Chlorides / Q000008:administration & dosage / Q000493:pharmacokinetics; D007408:Intestinal Absorption; D006109:Poaceae; D015203:Reproducibility of Results; D012756:Sheep; D012987:Soil
chemical_list: D002588:Cesium Radioisotopes; D002712:Chlorides; D012987:Soil; D002586:Cesium; C028019:cesium chloride