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Distribution of spatial photoneutrons inside a 70kg water phantom via neutron activation analysis
Mu-Tai Liu1, Sing-Sheng Huang, Wen-Shan Liu
1Department of Radiation Oncology, Changhua Christian Hospital, Changhua, Taiwan, Republic of China.
Abstract:
This study evaluated spatial Phi(th) inside a 70kg water phantom using the NAA method. Fifty indium foils were placed inside the water phantom and exposed under 15MV LINAC for 2.5min to yield the 10Gy X-ray dose. The Phi(th) value at the isocenter of the water was 1.03x10(6)ncm(-2)/Gy-X, and the maximum quantity of Phi(th) appeared at the water surface along the z-axis, 3.99x10(6)ncm(-2)/Gy-X. The thermal neutron dose at isocenter of the water phantom occupied approximately 0.151% of the whole photo and neutron dose.
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