Neutron scattering in concrete and wood.
In this work, the energy spectra of photoneutrons, scattered by ordinary, high-density concrete and wood barriers, have been evaluated using the MCNP4B code. These spectra were calculated for different scattering angles, and for incident neutron energies varying between 0.1 and 10 MeV. The results presented are required to simulate typical photoneutron fluence, produced by medical accelerators, which is scattered by the room walls and reaches the door. It was found that the mean energy of the scattered neutrons does not depend on the scattering angle. Furthermore, it was found that the scattered neutron energies are lower in wood and baryte concrete, which indicates that these materials can be used for lining the maze walls in order to reduce neutron dose at the room door. These data will help to estimate the personal dose received by the patient and staff in radiotherapy facilities.
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Comissão Nacional de Energia Nuclear, R. Gal. Severiano 90, sala 405, 22294-900, Rio de Janeiro-RJ, Brazil. afsoares@cnen.gov.br
Silva
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Falcão
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Crispim
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D016902:Air Pollution, Indoor / Q000032:analysis*; D003198:Computer Simulation; D003252:Construction Materials / Q000032:analysis*; D015233:Models, Statistical; D009502:Neutrons; D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000379:methods*; D011835:Radiation Protection / Q000379:methods*; D011868:Radioisotopes / Q000032:analysis*; D012542:Scattering, Radiation
D011868:Radioisotopes