Abstract

The Bonner sphere technique with activation foil made of natural tantalum is used to estimate doses during secondary particle irradiation. The neutron spectrum in the isocenter of a Varian Trilogy medical linear accelerator (linac) is calculated. The average neutron energy and the effective neutron cross section are determined. The flux of the (γ, n) reaction is calculated using a measured spectrum. The fluxes measured using Bonner spheres with a natural tantalum activation target correspond to the results from similar measurements obtained in other ways.

中文翻译：

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医学中的辐射技术：次级粒子在形成剂量中的作用

摘要

使用具有天然钽制成的活化箔的邦纳球技术来估算二次粒子辐照期间的剂量。计算了Varian Trilogy医用线性加速器（直线加速器）的等中心点的中子谱。确定平均中子能量和有效中子截面。（γ，n）反应的通量使用测得的光谱来计算。使用具有天然钽活化目标的Bonner球测量的通量与通过其他方式获得的类似测量结果相对应。