Ghassoun J, Senhou N
EPRA, Department of Physics, Faculty of Sciences Semlalia, PO Box: 2390, 40000 Marrakech, Morocco.
Appl Radiat Isot. 2012 Apr;70(4):620-4. doi: 10.1016/j.apradiso.2011.12.041. Epub 2011 Dec 30.
In this study, the MCNP5 code was used to model radiotherapy room of a medical linear accelerator operating at 18 MV and to evaluate the neutron and the secondary gamma ray fluences, the energy spectra and the dose equivalent distributions inside a liquid tissue-equivalent (TE) phantom. The obtained results were compared with measured data published in the literature. Moreover, the shielding effects of various neutron material shields on the radiotherapy room wall were also investigated. Our simulation results showed that paraffin wax containing boron carbide presents enough effectiveness to reduce both neutron and secondary gamma ray doses.
在本研究中，使用MCNP5代码对一台运行在18 MV的医用直线加速器的放疗室进行建模，并评估液体组织等效（TE）模体内部的中子和次级伽马射线注量、能谱以及剂量当量分布。将所得结果与文献中公布的测量数据进行了比较。此外，还研究了各种中子材料屏蔽对放疗室墙壁的屏蔽效果。我们的模拟结果表明，含碳化硼的石蜡具有足够的有效性来降低中子和次级伽马射线剂量。
