The accumulation of radioactive caesium by marine invertebrates

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Abstract
The accumulation of radioactive Cs has been studied in species from the principal marine invertebrate phyla. In some species the accumulation of radioactive Cs has been compared with that of 42K and equilibrium levels of both isotopes have been related to the distribution of inactive K.Radioactive Cs is always absorbed more slowly than 42K. Most of the inactive K is readily exchangeable with 42K so that at equilibrium inactive and active concentration factors are nearly equal. Whole animal concentration factors for radioactive Cs at equilibrium varied between 1·2 and 14 in unfed animals. These factors usually exceed those for inactive K because, although body fluid concentration factors are similar for both ions, the tissue/body fluid ratios for radioactive Cs exceed those for inactive K. Radioactive Cs penetrates rapidly into body fluids, so that uptake by the tissues is the limiting factor in accumulation. Although Cs is absorbed much more slowly than K, the eventual distribution of Cs between the tissues and body fluid of a particular species appears to bear a relationship to the distribution of K.No evidence has been found to suggest that Cs is a necessary element which is absorbed specifically.

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