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Monitoring of the occupational radiation exposure at Temelín nuclear power plant
CUPALOVÁ, Klára
This work deals with occupational professional exposures at Temelín Nuclear Power Plant. The introductory part is devoted to types of ionising radiation participating on radiation load of workers, values and units and to the essential legislation requests associated with individual monitoring. In the following part characteristics of methods used to measure individual doses of external exposures like film dosimetry, thermoluminescent do-simetry, radio-photoluminescent dosimetry and electronic dosimetry are described. For assessment of the committed effective dose from the internal exposures in vivo moni-toring or indirect measuring were used. The possibilities of the occupational dose optimisation were discussed Results of individual monitoring in 2005 and 2006 and layout of monitoring program are presented in this work. The new monitoring program is based on the active personal dosimeters (EPDs) rather than on the passive ones and covers the period of transformation between them. With respect to the passive dosimeters, EPDs offer some advantages which on one hand contribute to a better exposure control and on the other hand foster the development of a sound culture in radiation protection due to direct feedback of dose information.
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The threat of a terrorist radiation attack
RAŠÍNOVÁ, Libuše
The goals of this thesis are as follows: Firstly, I seek to assess the risk of a terrorist radiation attack. I also characterize the effects that the ionizing radiation has on the human being and outline a scenario of a possible radiation attack. Secondly, I evaluate what awareness of the civil defence exists among the students in the final year of the compulsory school attendance. Thirdly, I propose some measures to improve the situation.
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The effect of ionizing radiation on the complex of estrogen receptor with DNA
Štísová, Viktorie ; Běgusová, Marie
Estrogen receptor protein forms a specific complex with DNA bearing estrogen response element. The study of the effect of ionizing radiation on the stability of the complex is presented. Method of agarose gel electrophoresis was used to follow radiomodifying effects of estrogen, which is in conditions in vivo necessary for complex formation. Method of retardation polyacrylamide electrophoresis was used to determine overall stability of the complex as a function of absorbed dose.
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Monte Carlo modelování radiolýzy bází DNA
Kozelka, Jakub ; Běgusová, Marie
An attempt to explain differences in measured yields of modified bases determined in free bases and in the double stranded DNA is made with help of theoretical calculations. A theoretical model is applied to predict yields of reactions of the most important radiolytic product, OH• radical, with individual nucleobases, nucleosides and short DNA oligomers. The relation between spatial limitations for radical approach to particular reaction sites within DNA and the yields of damaged bases is discussed.
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Radiolysis of DNA-protein complexes
Běgusová, Marie
The summary of experimental measurements and theoretical predictions of radiolysis has been presented for two prokaryotic DNA- protein complexes: i)lac operator - lac repressor complex, ii) DNA bearing abasic site analog - Fpg protein.
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Odezva stopového LET spektrometru k vysokoenergetickým protonům
Jadrníčková, Iva ; Spurný, František
Risk from ionizing radiation depend both on the radiation quantity and the radiation quality.The radiation quality is characterized by the methods and the procedures of microdosimetry. Basic experimental microdosimetry approach is based on the use of tissue equivalent proportional counters. However, in some cases their use can be compromised, for example at high dose rates and/or in the presence of very intense low LET component in the radiation field to be characterized. For such purposes, the microdosimetry method based on a polyallyldiglycolcarbonate (PADC) chemically etched track-etch detectors (TED) was developed
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