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首页> 外文期刊>Radiation Protection Dosimetry >DOSE RATE AND ENERGY DISTRIBUTIONS OF X RAYS FROM A LINEAR ACCELERATOR AT THE MAZE ENTRANCE OF A RADIOTHERAPY ROOM BY MEASUREMENT AND MONTE CARLO SIMULATION
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DOSE RATE AND ENERGY DISTRIBUTIONS OF X RAYS FROM A LINEAR ACCELERATOR AT THE MAZE ENTRANCE OF A RADIOTHERAPY ROOM BY MEASUREMENT AND MONTE CARLO SIMULATION

机译：测量和蒙特卡罗模拟在放射治疗室迷宫入口处线性加速器的X射线剂量率和能量分布。

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摘要

The dose rates in a radiotherapy room and maze were measured and computed, using the Monte Carlo code for neutron and photon transport, MCNP, for 6 MV X rays at different field sizes and gantry angles. The contribution from leakage was also measured and computed. When a phantom (patient) was positioned at the isocentre the measured and computed doses at the maze entrance were increased by a factor of 2-3 times over that without a phantom present. The size of the phantom on which the primary beam was incident was not a sensitive factor in increasing the dose rate at the maze entrance. There was good agreement between the measurements and MCNP computations.The energy spectra of the photons (both the scattered and leakage components) near the maze entrance were measured and computed for a primary beam with a field size 20 mm X 20 mm for scatter and leakage.
机译：使用蒙特卡罗中子和光子传输的MCNP蒙特卡罗代码，对不同视场大小和机架角度的6 MV X射线测量并计算了放疗室和迷宫中的剂量率。还测量并计算了泄漏造成的影响。当将体模（患者）放在等中心时，迷宫入口处的测量剂量和计算剂量比没有体模的剂量增加了2-3倍。入射主光束的体模的大小并不是增加迷宫入口处剂量率的敏感因素。测量与MCNP计算之间有很好的一致性。对于迷宫入口附近的光子（散射和泄漏分量）的光子（包括散射和泄漏分量）的能谱进行了测量和计算，对于散射和泄漏的场大小为20 mm X 20 mm的主光束。

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