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Development of system reduction and limitation of doses in persons working with sources of ionizing radiation and in inhabitants
 TEPLÝ, Antonín
Development of system reduction and limitation of doses in persons working with sources of ionizing radiation and in inhabitants This dissertation discusses a system of limits and its development, i.e. how did the radiation dose limits change due to the safety of staff working with ionizing radiation and how did the limits of exposure of the population change. The introduction part of this dissertation deals with basic principles of radiation protection, namely with its optimization {--} with ALARA system. In the Current situation chapter there is a system of limits for reduction of radiation (Sec. 18 and 22 of the State Office for Nuclear Safety Decree No 307/2002 Sb.) and derived limits. The main part of this project focuses on monitoring of the practical development of the system of limits. In the Radiation Oncology Institute of the Faculty Hospital Na Bulovce (Ústav radiační onkologie Fakultní nemocnice Na Bulovce) archive I received data from the CSOD. I processed listing of both free-month and one-month doses received by the staff and I studied the way the doses decrease and mainly how does the number of personnel in whose cases the doses exceeded their limits decrease. I involved three most numerous groups of personnel. The first group consists of radiology assistants and analysts, the second group consists of medical doctors and physicists and the third group consists of medical nurses who were monitored only till 2003. The greatest decrease can be noticed since 2003 when the listings of radiation doses started being evaluated on monthly basis. I think that monthly evaluation of doses is a great landmark in the issue of protection of personnel involved with ionizing radiation. I transferred the data about these doses into several charts. I divided exceeded doses into individual scales and processed them statistically. There is a table in the discussion part of this dissertation work where even historical dose limits and dose equivalents are converted to mSv units (i.e. mSv/year) so that it would be possible to compare the limits. The process of radiation protection of the personnel in the Institute is also dealt with.
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