COMAR C L, RUSSELL R S, WASSERMAN R H
Science. 1957 Sep 13;126(3272):485-92. doi: 10.1126/science.126.3272.485.
The calcium reservoirs of the biosphere are becoming labeled to varying degrees with strontium-90 from nuclear weapons. These reservoirs include the human and animal skeleton, the milk, the vegetation, the upper layers of soil, and the waters. The degree of labeling is governed by the dilution that occurs, or the differential behavior of calcium and strontium in various steps of the food chain. This differential behavior normally provides a factor of protection against strontium-90 in the soil and vegetation that may be as high as 25 for the newborn and is most likely not less than 6 for adults, depending on food habits. The physiological steps that are important in the movement of the two elements in the biosphere are described to provide a basis for an approach toward increase of the discrimination against strontium in favor of calcium. Some aspects of agricultural practices are discussed from this standpoint. The matter of hazard from levels now existing and the present need to undertake remedial measures are not discussed, in major part because of lack of experimental data on which to base such considerations.
生物圈中的钙库正不同程度地被来自核武器的锶-90所标记。这些钙库包括人类和动物的骨骼、牛奶、植被、土壤上层以及水域。标记程度受稀释作用的影响，或者受食物链各个环节中钙和锶的不同行为的影响。这种不同行为通常为土壤和植被中的锶-90提供一定程度的防护因素，对于新生儿而言，该因素可能高达25，对于成年人而言，很可能不少于6，这取决于饮食习惯。文中描述了这两种元素在生物圈中移动时的重要生理步骤，以便为采取措施增加对钙而非锶的区分度提供依据。从这一角度讨论了一些农业实践方面的问题。对于当前存在的水平所带来的危害以及目前采取补救措施的必要性问题，本文未作讨论，主要原因是缺乏可供此类考量的实验数据。
