Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English, Russian   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (ru)

M. V. Zheltonozhska, N. V. Kulich^*, D. E. Myznikov, V. I. Slisenko

Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

^*Corresponding author. E-mail address: zhelton@kinr.kiev.ua

Abstract: Radionuclides behavior on strongly contaminated territories of 30-km Chernobyl zone was studied. Samples in two layers for determination of the possible impact of works on construction of the "Shelter" object were collected. As a result, abnormal A(²⁴¹Am)/A(¹³⁷Cs) ratio was observed on a number of samples. The value varies between 0.004 to 0.30. Activity of ⁹⁴Nb and ⁶⁰Co was observed on the number of samples. Problems with spectrometer calibration appeared, when samples from Chernobyl zone with low activity were used. Calibration on efficiency of γ-rays registration become complicated in low energy interval because of different density of the investigated samples. To solve this problem methodological researches were performed, taking into account efficiency variation of γ-rays registration in samples with big volume. For this purpose, activities of ¹³⁷Cs and γ-rays with 661 keV energy were compared. ¹³⁷Cs activity was defined from appearance of K_x-emission of Ba (36 keV).

Keywords: radionuclides, migration, americium, niobium, cobalt.

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