Rebello W F, Silva A X, Facure A
(PEN/COPPE-DNC/POLI)CT/UFRJ, Ilha do Fundão, PO Box 68509, 21945-970, Rio de Janeiro, RJ, Brazil.
Radiat Prot Dosimetry. 2008;128(2):227-33. doi: 10.1093/rpd/ncm312. Epub 2007 Jun 14.
This work aims at presenting a study using Monte Carlo simulation of a Multileaf Shielding (MLS) System designed to be used for the protection of patients who undergo radiotherapy treatment, against undesired exposure to neutrons produced in the components of the medical linear accelerator heads. The choice of radiotherapy equipment as the subject of study fell on the Varian Clinac 2,100/2,300 with MLC-120 operating at 18 MeV. The general purpose Monte Carlo N-Particle radiation transport code, MCNP5, was used in the computer simulation in order to determine the ambient dose equivalent, H (10), on several points on the patient's plane, with the equipment operation with and without the MLS. The results of the simulations showed a significant neutron dose reduction after the inclusion of the proposed shielding.
这项工作旨在展示一项研究，该研究使用蒙特卡罗模拟多叶屏蔽（MLS）系统，该系统旨在用于保护接受放射治疗的患者，使其免受医用直线加速器机头部件中产生的中子的意外照射。作为研究对象的放射治疗设备选择了瓦里安Clinac 2100/2300，其MLC - 120在18 MeV能量下运行。在计算机模拟中使用了通用蒙特卡罗N粒子辐射输运代码MCNP5，以确定在有和没有MLS的设备运行情况下，患者平面上几个点的周围剂量当量H(10)。模拟结果表明，加入所提出的屏蔽后，中子剂量显著降低。
