A method of calculating high-energy photon primary absorbed dose in water using forward and backward spread dose-distribution functions.
A method of calculating high-energy photon primary absorbed dose in water using forward and backward spread dose-distribution functions.
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一种利用前向和后向扩散剂量分布函数计算水中高能光子初级吸收剂量的方法。
DOI：
10.1118/1.595656
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发表时间：
1985
期刊：
影响因子：
3.8
通讯作者：
A. Iwasaki
中科院分区：
文献类型：
--
作者：
A. Iwasaki
半无限或有限水体模中高能光子初次吸收剂量沿光路沿着的完整分布可用一个函数方程表示。推导是基于一种技术的卷积的初级碰撞比释动能分布函数与一对向前和向后扩展剂量分布函数。特别地，可以获得在射束入口和出口表面附近的区域中的初级剂量的特征图案。计算得到水中电子平衡区60Co辐射的初级剂量与初级碰撞比释动能之比为1.0060，25 MV辐射的初级剂量与初级碰撞比释动能之比为1.0444。
The complete distribution of high-energy photon primary absorbed dose along the beam path within a semi-infinite or finite water phantom can be expressed by one functional equation. The derivation is based on a technique of convoluting a primary collision kerma distribution function with a pair of forward and backward spread dose-distribution functions. In particular, the characteristic patterns of primary dose in the regions near the beam entrance and exit surfaces can be obtained. The calculated ratio of primary dose to primary collision kerma in the electron-equilibrium region in water for 60Co radiation is 1.0060 and that for 25-MV radiation is 1.0444.