%0 Dataset
%T Monte Carlo simulation of the radiotherapy properties of 200 MeV proton by several different material energy deminerators
%J National Cryosphere Desert Data Center
%I National Cryosphere Desert Data Center(www.ncdc.ac.cn)
%U http://www.ncdc.ac.cn/portal/metadata/6d9b22da-0817-470b-addf-3e880c2b98ec
%W NCDC
%R 10.12072/ncdc.imp.db4088.2023
%A Xiao Guoqing
%K Proton radiotherapy;transducer;Monte Carlo;Topas;transfer efficiency
%X In this paper, the Monte Carlo software Topas is used to simulate the transport process of 200 MeV protons in multi wedge structure energy reducers made of graphite, beryllium and boron carbide. The energy fluxes of protons and secondary neutrons after passing through the energy reducers are calculated, and the energy dispersion of proton beam after passing through different energy reducers is calculated, Based on this, the relationship between the thickness of three kinds of energy reducers and the proton energy is obtained. The influence of different energy reducers on the proton beam transmission efficiency and the secondary neutron yield are also analyzed. By comparison, it is found that the three kinds of energy reducers have the same effect on the beam energy divergence, and the use of beryllium or boron carbide can improve the beam transmission efficiency, especially the performance of beryllium energy reducers is better. However, the interaction of beryllium and boron carbide with protons will produce more secondary neutrons, so more attention should be paid to the radiation protection of secondary neutrons in practical applications.