PHITS code Monte Carlo simulation of a gamma chamber 5000.

IF 1.5 4区 环境科学与生态学 Q3 BIOLOGY
Okky Agassy Firmansyah, Budhy Kurniawan, Marta Walo, Urszula Gryczka, Bimo Saputro, Heru Prasetio, Ari Satmoko, Nunung Nuraeni
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Abstract

Gamma Chamber 5000 (GC-5000) is a dry storage irradiator manufactured by the Board of Radiation and Isotope Technology, India. The GC-5000 can be employed as a facility for sample irradiation and dosimeter calibration purposes because of its dose distribution which is more homogeneous than that of large-scale gamma irradiators. However, optimizing the calibration service requires an in-depth understanding of the dose mapping within the sample chamber. This study aimed to demonstrate the applicability of a simulation using the Monte Carlo (MC) Proton Heavy-Ion Transport Code System (PHITS) software for determining the dose distribution within the GC-5000 irradiator at the Institute of Nuclear and Chemistry Technology (INCT), Poland, to validate the results in experiments using alanine dosimetry. Five measurement points were defined, with each point carrying four alanine dosimeters simultaneously irradiated in an in-house phantom manufactured from polymethyl methacrylate (PMMA). The in-house phantom and alanine dosimeters were additionally simulated with PHITS. The GC-5000 chamber was modeled consistently with the original GC-5000 design, which included the configuration of 44 Co-60 pencil sources and their activities. The relative differences between simulation and experiment for the five-point measurements were 0.7 % and 7.0 % for the minimum and maximum, respectively. The position with the best agreement was at the centre of the in-house PMMA phantom. It was found that the results of the MC simulation and the experimental dose mapping agreed. It is concluded that both methods can be used to precisely determine the dose rate at defined positions within the GC-5000. It is concluded that the methodology developed in this study, i.e., the integration of MC modeling and alanine dosimetry, provides a validated and practical approach for dose mapping and may serve as a reference for similar compact irradiators used in radiation processing. The methodology can also be extended to optimize other industrial radiation processing facilities, as it provides a robust framework for accurate dose calibration and dose rate mapping.

PHITS代码蒙特卡罗模拟一个伽马室5000。
伽马室5000 (GC-5000)是由印度辐射和同位素技术委员会制造的干式贮存辐照器。GC-5000可作为样品辐照和剂量计校准的设备,因为它的剂量分布比大型伽玛辐照器更均匀。然而,优化校准服务需要对样品腔内的剂量映射有深入的了解。本研究旨在证明使用蒙特卡罗(MC)质子重离子输运编码系统(PHITS)软件进行模拟的适用性,以确定波兰核与化学技术研究所(INCT) GC-5000辐照器内的剂量分布,并验证丙氨酸剂量学实验结果。定义了五个测量点,每个测量点携带四个丙氨酸剂量计,同时在由聚甲基丙烯酸甲酯(PMMA)制造的内部模体中照射。另外用PHITS模拟内部幻影和丙氨酸剂量计。GC-5000燃烧室的模型与最初的GC-5000设计一致,其中包括44个Co-60铅笔源及其活动的配置。5点测量值的模拟值与实验值的相对差异最小值为0.7%,最大值为7.0%。达成最佳协议的位置位于内部PMMA幻影的中心。MC模拟结果与实验剂量图吻合较好。结果表明,这两种方法都可以精确地测定GC-5000中特定位置的剂量率。综上所述,本研究开发的方法,即MC建模和丙氨酸剂量学的集成,为剂量测绘提供了一种有效和实用的方法,可为辐射处理中使用的类似紧凑型辐照仪提供参考。该方法还可以扩展到优化其他工业辐射处理设施,因为它为准确的剂量校准和剂量率绘图提供了强有力的框架。
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
CiteScore
4.00
自引率
5.90%
发文量
53
审稿时长
>36 weeks
期刊介绍: This journal is devoted to fundamental and applied issues in radiation research and biophysics. The topics may include: Biophysics of ionizing radiation: radiation physics and chemistry, radiation dosimetry, radiobiology, radioecology, biophysical foundations of medical applications of radiation, and radiation protection. Biological effects of radiation: experimental or theoretical work on molecular or cellular effects; relevance of biological effects for risk assessment; biological effects of medical applications of radiation; relevance of radiation for biosphere and in space; modelling of ecosystems; modelling of transport processes of substances in biotic systems. Risk assessment: epidemiological studies of cancer and non-cancer effects; quantification of risk including exposures to radiation and confounding factors Contributions to these topics may include theoretical-mathematical and experimental material, as well as description of new techniques relevant for the study of these issues. They can range from complex radiobiological phenomena to issues in health physics and environmental protection.
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