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0221U106943,
0121U108100
,
Studying and optimization of parameters of nuclear-physical facilities using mathematical modeling methods
Khazhmuradov Manap A., д.т.н.
22-12-2021
National Science Center "Kharkiv Institute of Physics and Technology"
Characteristics of the prototype of a portable dosimeter based on CZT detector "CZT / 60", manufactured by RITEC were studied. The device can be used to measure the absorbed dose / dose rate from low-energy radiation sources (in particular, Am-241), based on the parameters of the measured spectra. Sample gamma radiation sources Am-241, Cs-137, Co-60 and Eu-152 were used to characterize the CdZnTe detector. To calculate the dependence of sensitivity on energy, simulation of the device response using the Monte Carlo method was used. To determine the measurement error, calibration measurements of the exposure dose rate at the Am-241 sample source were performed. An interactive graphic system of mathematical modeling of the boundary magnetic surface has been developed, which provides calculation of the topology of magnetic field lines and allows to increase the accuracy of calculations in the design of toroidal magnetic systems. An assessment of the radiation dose received by specialists involved in the X-ray examination of the upper gastrointestinal tract in children and forced to be near the X-ray unit during the examination. All five positions of the patient during the procedure were compared and certain factors that affect the dose were studied: the size of the X-ray field, the distance from the specialist to the isocenter, the thickness of the lead apron, additional filtration. A polyethylene mannequin filled with water was used to simulate the body of the patient and the assistant. An approximate model of cross-sectional calculations of the annihilation process of the ultra-relativistic positron and electron pair in the crystal is proposed, which can be used for the estimates required in planning the next steps of the study on this topic.
2021-12-22
Updated: 2025-12-17
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