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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Comparison of dosimeters and radiometers for the laic public
 DŽURNÝ, Vladan
This work aims to compare the technical parameters of individual measuring devices (radiometers and dosimeters) for the general public with similar professional equipment used by SÚJB České Budějovice and HZS České Budějovice and based on the comparison to answer the research question whether dosimeters and radiometers are available for the general public. able to compete with similar equipment used by SÚJB České Budějovice and HZS České Budějovice. The practical part of the work is focused on the quantitative processing of selected technical parameters of all selected investigated devices using multicriteria analysis and their comparison using CLA analysis. Based on the mentioned methods, the aim of the work is fulfilled and the research question is answered. For comparison, he was selected from professionals as a similar device URAD 115 (HZS České Budějovice) and FH 40 G (SÚJB České Budějovice). The following device was chosen from the devices intended for the general public: Gamma Scout, RD1008, SOEKS 112, BR 6, BR 9B and VOLTCRAFT Gamma-Check-A. The results of multicriteria and CLA analysis showed that the investigated devices intended for the general public are not able to compete with professional devices URAD 115 and FH 40 G. It was found that the investigated devices intended for the general public are characterized by lower weight and ability to detect beta radiation. Furthermore, the fact that the Gamma Scout device is able to detect alpha radiation in addition to the above radiation. The results of the work contribute to the evaluation of the usability of the investigated devices for the purposes of SÚJB České Budějovice and HZS České Budějovice in solving a radiation emergency. It also helps to assess the quality of the devices examined.
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Correlation of Cs - 137 content between soil and sponge Deer truffle
 DŽURNÝ, Vladan
In recent years, the issue of increased contamination of Cs-137 wild boar meat has come to the fore. One of the dominant agents of this contamination is Deer truffle because of its ability to accumulate Cs-137 in large quantities. The so-called transfer factor (hereinafter referred to as "TF") allows us to assess the ability of Deer truffle to absorb Cs-137. The aim of this work is to measure TF Cs-137 in the fungus Deer truffle and compare it with TF for other fungi. In order to calculate TF, the weight activity of Cs-137 in the individual samples was determined (Deer truffle and the soil in which it was found). The Cs-137 mass activity was measured in the laboratory of the SÚJB Regional Center in České Budějovice using the HPG gamma detector and subsequently determined in the Gamwin program. A total of 6 samples from the South Bohemian Region were measured. The highest measured value of Cs-137 activity was found in Okrouhlá I (soil: 105 Bq.kg-1), (Deer truffle: 2030 Bq.kg-1). The largest calculated TF = 19.3 (Okrouhlá I) was compared to the TF of 26 fungal species from the selected publication. A very strong correlation was found between the amount of Cs-137 in the soil and the Deer truffle. The observed TF is significantly greater than the TF of the compared fungi. The strong correlation and significant TF value represent the potential of Deer truffle to absorb much larger amounts of Cs-137 than the fungal species compared, confirming the work hypothesis. The results of the work can help to clarify the origin of the high content of Cs-137 in the meat of wild boars and can also provide a basis for further investigation of this issue.
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