Fractionation of technogenic radionuclides species in water bodies of Semipalatinsk Test Site

Торопов, А.С.

Автор: Торопов А.С.
Журнал: Известия Томского политехнического университета. Инжиниринг георесурсов
Том: 329
Номер: 6
Год издания: 2018
Издательство: ГОУ ВПО ТПУ
Местоположение издательства: Томск
Первая страница: 74
Последняя страница: 86
Аннотация: The relevance of the study is defined by the ability of technogenic radionuclides contained in significant quantities in surface water bo dies of the Semipalatinsk test site, to move beyond the nuclear test sites. This ability is determined by the speciations of radioactive ele ments. The issue of migration and influence of species of technogenic radionuclides in water bodies has not been studied enough to pre dict the behavior of radioactive elements on a longterm basis. The aim of the work is to study the speciation of radionuclides in the water bodies of the Semipalatinsk test site. Methods. Distribution of species of radioactive elements was studied using the sequential cascade fractionation. Water pH was defined potentiometrically using Anion4100 devise. The components of chemical composition of natural water and total dissolved solids were determined in accordance with All Union State standard 26449.1–85. The content of dissolved organic matter was identified by the dichromatic oxidation method with a measurement on a PE5300VI spectrophotometer. The content of radioactive isotopes was deter mined by radiochemical separation methods with the preparation of a counting sample for alpha spectrometry of 239+240Pu, liquidscintil lation beta spectrometry of 90Sr, and highly sensitive gamma spectrometry with a well type hidhpurity germanium semiconductor de tector after preconcentration for 137Cs and 241Am. Results. The cascade fractionation method using a set of membranes with decreasing pore size is suitable for separation of suspended, pseudocolloidal, colloidal and dissolved species in natural waters. The author has obtained the data of chemical and isotopic composition of individual water bodies of the Semipalatinsk test site as well as content and speciations of radionuclides. It was found that 137Cs in wa ter migrates in colloid and dissolved forms, the predominant species of 90Sr is dissolved, fractionation of 239+240Pu was specific for each water body. The water of the waterstream outflowing from tunnel No. 177 is characterized by the predominance of dissolved form for all studied radionuclides.
Добавил в систему: Торопов Андрей Сергеевич

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Fractionation of technogenic radionuclides species in water bodies of Semipalatinsk Test Siteстатья Исследовательская статья

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