The paper presents the results of 90Sr/137Cs isotopic ratios in the soil surface layer in the venues of surface and atmospheric nuclear tests at the territory of the «Experimental Field » site of the Semipalatinsk Test Site. One of the main factors in the radiation impact of a nuclear explosion on the environment is the decay of fission products. The determination of 137Cs activity in soil is carried out by accurate, rapid and sufficiently cheap gamma-spectrometric method, while the existing methods of determining 90Sr activity are quite problematic: they either have sufficiently high detection limits or are time-consuming. As an alternative method, 90Sr activity can be determined using its correlation dependence with 137Cs activity. According to the literature, each test has its own fission product ratio, depending on the nuclear charge. As a result of the conducted research it was revealed that one epicenter is located at the technical site P-1, the ratio of 90Sr/137Cs is equal to 4,8; at the technical site P-3 - 2 epicenters, the ratio of 90Sr/137Cs is equal to 0,8 and 0,9; at the technical site P-5 - 6 epicenters, the ratio of 90Sr/137Cs is in the range of 0,9-2,1; at the technical sites P-2, P-7 - 19 epicenters, the ratio of 90Sr/137Cs is in the range of 0,6-2,1. It is assumed that the differences in the value of fission product ratios are due to different types and capacities of nuclear charges, as well as different explosion altitudes. The obtained ratios allow to calculate 90Sr by 137Cs activity in soil of the epicentral zones at the territory of the «Experimental Field » testing site by the computational method.

中文翻译：

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Semipalatinsk试验场“实验场”试验场中心区土壤中90Sr / 137Cs比。

本文介绍了在塞米巴拉金斯克试验场“实验场”现场的地面和大气核试验场所土壤表层中90Sr / 137Cs同位素比的结果。核爆炸对环境的辐射影响的主要因素之一是裂变产物的衰减。土壤中137 Cs活性的测定是通过准确，快速且足够便宜的伽马光谱法进行的，而现有的测定90Sr活性的方法则存在很多问题：它们的检测限足够高或很费时。作为一种替代方法，可以使用90Sr活性与137Cs活性的相关性来确定其活性。根据文献，每个测试都有自己的裂变产物比率，具体取决于核电荷。进行研究的结果表明，一个震中位于技术站点P-1上，90Sr / 137Cs的比率等于4,8；在技​​术中心P-3-2震中，90Sr / 137Cs的比率等于0.8和0.9；在技​​术中心P-5-6震中，90Sr / 137Cs的比率在0.9-2.1之间。在P-2，P-7-19震中，90Sr / 137Cs的比率在0.6-2.1之间。假定裂变产物比率值的差异是由于核装料的类型和容量不同以及爆炸高度不同所致。所获得的比率允许通过计算方法来计算“实验场”试验场区域的震中区土壤中137Cs的90Sr活度。