Mesbahi Asghar, Ghiasi Hosein, Mahdavi Seyed Rabee
Medical Physics Department, Medical School, Tabriz University of Medical Sciences. Tabriz, Iran.
Radiat Prot Dosimetry. 2010 Aug;140(3):242-9. doi: 10.1093/rpd/ncp303. Epub 2010 Jan 18.
In this paper the effect of treatment room and maze layout on the photoneutron and capture gamma dose equivalent in the maze was studied. MCNPX Monte Carlo (MC) code was used to simulate the Varian 2100 C/D Clinac 18 MV and four different room layouts. Two analytical methods, Wu-McGinley and McGinley, were used for dose calculations. The analytical methods overestimated the photoneutron dose (13-43 %) and gamma capture dose (16-95 %) comparing with the MC method at the maze entrance door. The results of MC method revealed that additional bend can cause a great reduction in photoneutron (5000 times) and capture gamma dose (50 times) in the maze entrance door.
本文研究了治疗室和迷宫布局对迷宫中光中子和俘获γ剂量当量的影响。使用MCNPX蒙特卡罗（MC）代码模拟瓦里安2100 C/D直线加速器18 MV以及四种不同的房间布局。剂量计算采用了两种解析方法，即吴-麦金利法和麦金利法。与MC方法相比，在迷宫入口处，解析方法高估了光中子剂量（13%-43%）和γ俘获剂量（16%-95%）。MC方法的结果表明，增加弯道可使迷宫入口处的光中子剂量（降低5000倍）和俘获γ剂量（降低50倍）大幅减少。
