Karimi Amir Hossein, Vega-Carrillo Hector Rene
Department of Medical Physics, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Unidad Academica de Estudios Nucleares de la Universidad Autonoma de Zacatecas C. Cipres 10, Fracc, La Peñuela, 98068, Zacatecas, Zac, Mexico.
Appl Radiat Isot. 2020 Apr;158:109064. doi: 10.1016/j.apradiso.2020.109064. Epub 2020 Jan 29.
The present Monte Carlo study was devoted to the comparison of photoneutron contamination (per 1 Gy photon dose), along the maze of a radiotherapy bunker, between two 18-MV modalities: grid therapy (with grids made of brass, cerrobend, and lead) and conventional radiotherapy. It was turned out that both in grid therapy and in conventional radiotherapy, with increasing distance from the entrance of treatment hall (toward the maze entrance), fluence and ambient dose equivalent of neutrons decrease. Evidence also shows that in grid therapy, independent of materials used in the grid construction, photoneutron contamination along the maze is 45±6 % larger than conventional radiotherapy.
本蒙特卡罗研究致力于比较两种18兆伏放疗方式（格栅放疗（使用由黄铜、铈铍青铜和铅制成的格栅）和传统放疗）在放射治疗掩体迷宫中光子中子污染情况（每1戈瑞光子剂量）。结果表明，在格栅放疗和传统放疗中，随着距治疗室入口距离增加（朝着迷宫入口方向），中子注量和周围剂量当量均降低。证据还表明，在格栅放疗中，无论格栅构建中使用何种材料，沿迷宫的光子中子污染都比传统放疗大45±6%。
