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Dose analysis of the MAPE Mydlovary staff
RŮŽIČKOVÁ, Eliška
In the previous century a uranium ore chemical processing plant was constructed about 20 km from České Budějovice called MAPE Mydlovary, which employed approximately 1,100 employees at various times. We can assume that radionuclides affected the company's employees during the processing of uranium ore and the subsequent storage of waste in the adjoining sludge lagoons. They were irradiated by a total of three radiation components, which included gamma radiation, short-lived radon decay products and long-lived radionuclides from the uranium decay chain emitting alpha radiation. This is why this bachelor's thesis is devoted to analysis and evaluation of the percentage of individual radiation components in the total dose received by former MAPE Mydlovary employees. The purpose of this work is to establish how the individual radiation components were distributed in the doses of radiation received by former employees. The dosimetric sheets of former MAPE Mydlovary employees, who received all three types of radiation, were analysed in order to answer the research question. Dosimetric sheets were reduced so that each sheet contained all the required information. The established average annual doses of all three types of radiation and the total effective doses were converted into a graph, evaluated and subsequently compared with the valid legislation. On the basis of evaluation of the acquired data we can state that long-lived radionuclides from the uranium decay chain emitting alpha radiation made up the highest percentage of the radiation doses received by former MAPE Mydlovary employees, at a total of 49%. Inhalation of short-lived radon decay products made up 29% and external gamma radiation just 22%. The radiation limit for radiation workers of 20 mSv/year on the total effective dose from exterior radiation and on the committed effective doses from internal radiation was exceeded by 8 former employees according to our current legislation. We must state that no rules were broken according to Czech legislation valid between 1960 and 1970, because the limit for radiation workers was set at 50 mSv/year.
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