Photon and Neutron Dose Estimation Using Monte Carlo Simulation in TrueBeam's Room.

IF 0.7 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING Journal of Medical Physics Pub Date : 2024-07-01 Epub Date: 2024-09-21 DOI:10.4103/jmp.jmp_70_24

Soai Dang Quoc, Toshioh Fujibuchi, Hiroyuki Arakawa, Keisuke Hamada

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Abstract

Purpose: The distribution of neutron ambient dose equivalent within the TrueBeam 10 MV photon chamber was investigated.

Materials and methods: The research used particle and heavy ion transport code system (PHITS) code and JENDL-5.0 to simulate the neutron ambient dose equivalent on and around TrueBeam's head. The simulated results were compared with the measured results using CR-39 detectors when TrueBeam radiated 5000 monitor units of 10 MV photons with field sizes 20 cm × 20 cm and 0.5 cm × 0.5 cm.

Results: Out of field size, the neutron ambient dose equivalents of the 0.5 cm × 0.5 cm field size are higher than those values of the 20 cm × 20 cm field size from 4% to 30%. The differences between the simulated value and the measured value of the neutron ambient dose equivalents at all points out of field size are smaller than 20%.

Conclusion: The neutron ambient dose equivalents, simulated with PHITS and JENDL-5.0, are satisfied with the measured neutron ambient dose equivalent.

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在 TrueBeam 实验室中使用蒙特卡罗模拟估算光子和中子剂量。

目的：研究 TrueBeam 10 MV 光子舱内中子环境剂量当量的分布：研究使用粒子和重离子传输代码系统 (PHITS) 代码和 JENDL-5.0 模拟 TrueBeam 头部和周围的中子环境剂量当量。模拟结果与使用 CR-39 探测器测量的结果进行了比较，当时 TrueBeam 辐射了 5000 个监测单位的 10 MV 光子，磁场大小为 20 厘米×20 厘米和 0.5 厘米×0.5 厘米：结果：在各种场尺寸中，0.5 厘米 × 0.5 厘米场尺寸的中子环境剂量当量比 20 厘米 × 20 厘米场尺寸的中子环境剂量当量高出 4% 到 30%。场外各点的中子环境剂量当量模拟值与测量值的差异均小于 20%：结论：用 PHITS 和 JENDL-5.0 模拟的中子环境剂量当量与测量的中子环境剂量当量相符。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Medical Physics RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

1.10

自引率

11.10%

发文量

审稿时长

30 weeks

期刊介绍： JOURNAL OF MEDICAL PHYSICS is the official journal of Association of Medical Physicists of India (AMPI). The association has been bringing out a quarterly publication since 1976. Till the end of 1993, it was known as Medical Physics Bulletin, which then became Journal of Medical Physics. The main objective of the Journal is to serve as a vehicle of communication to highlight all aspects of the practice of medical radiation physics. The areas covered include all aspects of the application of radiation physics to biological sciences, radiotherapy, radiodiagnosis, nuclear medicine, dosimetry and radiation protection. Papers / manuscripts dealing with the aspects of physics related to cancer therapy / radiobiology also fall within the scope of the journal.