TECHNETIUM ABSORPTION AND TURNOVER IN MONOGASTRIC AND POLYGASTRIC ANIMALS
Technetium released into the environment can attain mammals in various chemical forms: pertechnetate in drinking water or deposited on the surface of vegetables and forage plants, or technetium bio-incorporated into plants and associated with various plant constituents. In addition to being influenced by chemical speciation in the diet, technetium absorption, metabolism and retention in animals is modified by the treatment the alimentary bolus undergoes during its transfer through the gastro-intestinal tract. This behaviour differs markedly between poly- and monogastric animals. We have, therefore, studied the fate of technetium-95m given in the diet either as pertechnetate or bio-incorporated into maize in rats + as an example of a monogastric animal + and in sheep + as an example of a polygastric animal. Urine and feces were collected and assayed for technetium activity by gamma spectrometry. Animals were sacrificed at different times after contamination, and the technetium content of tissues was determined. The pattern of absorption, excretion and, to a certain degree, of organ distribution and retention depended on animal species and speciation of technetium administered. Excretion was by way of feces and urine, and several metabolic components could be discerned. A component of very short half life in urine suggests that newly absorbed Tc is more readily excreted than that already bound by tissues. Highest tissue concentrations were found in the thyroid. Retention of technetium was, however, most pronounced in bone and skin. Hair contains considerable amounts of technetium and may serve as a bio-indicator of technetium contamination.
Bibliographic Reference: BEHAVIOUR OF TECHNETIUM IN TERRESTRIAL AND AQUATIC ENVIRONMENTS, SEATTLE, WASHINGTON (USA), MAY 5-10, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32987 ORA
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Record Number: 1989125027400 / Last updated on: 1987-03-01
Available languages: en