Distribution of spatial photoneutrons inside a 70 kg water phantom via neutron activation analysis

作者：Liu Mu Tai; Huang Sing Sheng; Liu Wen Shan; Yea Da Ming; Pan Lung Kwang; Chen Chien Yi^*

来源：Applied Radiation and Isotopes, 2010, 68(9): 1816-1821.

DOI：10.1016/j.apradiso.2010.03.017

• Photoneutron
• Indium foils activation
• Spatial thermal neutron
• Water phantom
• LINAC

This study evaluated spatial Phi(th) inside a 70 kg water phantom using the NAA method. Fifty indium foils were placed inside the water phantom and exposed under 15 MV LINAC for 2.5 min to yield the 10 Gy X-ray dose. The Phi(th) value at the isocenter of the water was 1.03 x 10(6) n cm(-2)/Gy-X, and the maximum quantity of Phi(th) appeared at the water surface along the z-axis, 3.99 x 10(6) n cm(-2)/Gy-X. The thermal neutron dose at isocenter of the water phantom occupied approximately 0.151% of the whole photo and neutron dose.

• 出版日期2010-9