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

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• 作者：Mu-Tai Liu ; Sing-Sheng Huang ; Wen-Shan Liu ; Da-Ming Yea ; Lung-Kwang Pan ; Chien-Yi Chen
• 关键词：Photoneutron ; Indium foils activation ; Spatial thermal neutron ; Water phantom ; LINAC
• 刊名：Applied Radiation and Isotopes
• 出版年：2010
• 出版时间：September 2010
• 年：2010
• 卷：68
• 期：9
• 页码：1816-1821
• 全文大小：401 K

文摘

This study evaluated spatial Φ_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 Φ_th value at the isocenter of the water was 1.03×10⁶ n cm⁻²/Gy-X, and the maximum quantity of Φ_th appeared at the water surface along the z-axis, 3.99×10⁶ 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.