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PubMed1971

The behavior of 137Cs and other fallout radionuclides on a Michigan dairy farm.

The behavior of the fallout radionuclides 137Cs, 54Mn, 14Ce-Pr and 90Sr in the milk-food chain was studied at a commercial dairy farm near Tecumseh, Michigan during 1964 and 1965. The main purpose of the study was to develop mathematical models to describe the movement of radionuclides from air to milk. Three models are presented: the first predicts the total deposition on precipitation collectors given the air concentration and rainfall rate; the second predicts the concentration in forage from air concentration, rainfall rate, and the rates at which the forage grows and is consumed by the dairy herd; the third predicts the milk concentration from the concentration in each type of feed and the rate at which each feed type is consumed by the dairy herd. The first two models are applicable to all four radionuclides but the milk model is valid only for 137Cs. Milk concentrations for the other three radionuclides are treated individually. The model for deposition on precipitation collectors was developed independently and is shown to predict weekly deposition rates to within a factor of three (95% of the time). This uncertainty is reduced as the time span for the prediction is increased. Development of the other two models was based in part on data from the Tecumseh study; both still require independent verification. The forage model fits the weekly experimental data to within a factor of 2.2. The milk model fits the weekly measurements of 137Cs concentrations to within a factor of 1.5. The error of the latter 2 models also decreases as the time span for the prediction is increased.

Animals↗
PubMed1971

[Relations between the contamination of beef and cow's milk with radiocesium].

The paper presents the results of an experimental investigation designed to study the trend of the contamination by radiocesium of milk and meat of cows: (1) under conditions of a single contamination of the pasture. (2) under conditions of a continuous ingestion corresponding to the case of a constant contamination of the pasture. The knowledge of the evolution in the course of time of the relation between the activities of meat and milk and of its dependence on the nature of the different organs and the age of the animals should make more easy the survey of the contamination of the environment and allow to decide on possible countermeasures to be taken in the case of an accident.

Animals↗
PubMed1971

Reduction in the absorption and retention of strontium in rats.

Rats were fed a stock diet supplemented with calcium phosphate and sodium alginate, both separately and simultaneously, over a period of 4-5 months. Observations were made at intervals on the growth rate and on visual and histological abnormalities in some body tissues. No toxic effects were observed. The absorption and skeletal retention of calcium for rats on the combined supplements remained almost unchanged but the absorption and retention of strontium was reduced 7-fold.

Alginates↗
PubMed1971

Radionuclides and selected trace elements in marine protein concentrates.

The concentrations of various trace elements and radionuclides have been measured in marine protein concentrates prepared from surface feeding fishes. As with concentrates prepared from benthic fishes, the 210Pb-210Po pair are the most significant radionuclides present. Concentrations of stable Pb, Co and Ag in certain concentrates are sufficiently high to contribute substantially to estimated current intakes of these elements.

Animals↗