Neutron Spectral Measurement at the Proton Therapy Room of the National Cancer Center of Korea
| Autor: | Sebyeong Lee, Sunmi Jun, Sang-eun Han, Bong-Hwan Kim, Jong-Su Kim, Dong Ho Shin, Jeongwan Kwon |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Bonner sphere Nuclear and High Energy Physics Proton Nuclear Theory Physics::Medical Physics Radiochemistry Neutron spectroscopy Nuclear physics Nuclear Energy and Engineering Neutron flux Physics::Accelerator Physics Neutron detection Neutron Nuclear Experiment Proton therapy Beam (structure) |
| Zdroj: | Journal of Nuclear Science and Technology. 45:229-232 |
| ISSN: | 1881-1248 0022-3131 |
| DOI: | 10.1080/00223131.2008.10875829 |
| Popis: | The neutrons, which are mainly induced from a beam modulator and two beam flattening scatters bombarded by high energetic protons inside the gantry of the proton therapy unit of the National Cancer Center (NCC) of Korea, were measured by using the Bonner Sphere (BS) of the Korea Atomic Energy Research Institute (KAERI). Protons were accelerated to 218 MeV using a cyclotron and guided to a gantry for modulating of the beam size and energy. The modulated proton beam irradiated the surface of a water phantom to simulate a condition of a proton therapy. Neutron spectral measurements were performed at two proton therapy rooms with a rotational and a fixed gantry respectively for different beam directions of the proton beam. The fluence average energies were 3.14 and 2.92 MeV at the two measuring positions respectively and there was a significant fraction of low energy neutrons under 0.5 eV. Dose equivalent rates were consistent to within 10% with the survey data measured by a neutron remmeter. Two kinds of neu... |
| Databáze: | OpenAIRE |
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