Dose mapping of an irradiation chamber of a gamma cell unit using Fricke gel dosimeters and Monte Carlo simulation

IF 1.6 3区工程技术 Q3 CHEMISTRY, INORGANIC & NUCLEAR Applied Radiation and Isotopes Pub Date : 2024-12-12 DOI:10.1016/j.apradiso.2024.111631

Elham Edalatkhah, Shahryar Badiei

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Abstract

A gamma cell unit is used for gamma irradiation of small volume samples. Due to the sample volume, there is a dose distribution, which is imperative to be known for appropriate irradiation. In this study, samples of agarose Fricke gel dosimeters were prepared for the dose mapping of the gamma cell unit available in our laboratory. To place the dosimeters at precise locations within the irradiation chamber of the gamma cell unit, a specific phantom was designed and fabricated. In this way, the dose distribution was estimated using optical absorbance measurement of the gel dosimeters. For verification, isodose curves were also obtained using Monte Carlo simulations. The results indicate that the central east-west and north-south points in the irradiation chamber have the highest and lowest dose values, respectively. The experimental and simulation ratios of the dose uniformity was calculated to be 1.53 and 1.48, respectively. The accuracy of the dosimeter performance and the system’s calibration quality are confirmed by the good agreement between the simulation and experimental results.

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利用弗里克凝胶剂量计和蒙特卡洛模拟绘制伽马单元辐照室的剂量图。

伽玛细胞单元用于小体积样品的伽玛辐照。由于样品的体积，有一个剂量分布，这是必要的，知道适当的辐照。在本研究中，我们制备了琼脂糖Fricke凝胶剂量计样品，用于我们实验室可用的伽马细胞单元的剂量测绘。为了将剂量计精确地放置在伽马细胞单元的辐照室内，设计并制造了一个特定的模体。这样，使用凝胶剂量计的光学吸光度测量来估计剂量分布。为了验证，用蒙特卡罗模拟得到了等剂量曲线。结果表明，辐照室内的中部、东西向和南北向分别具有最高和最低的剂量值。计算得到剂量均匀性的实验比和模拟比分别为1.53和1.48。仿真结果与实验结果吻合较好，验证了该剂量计性能的准确性和系统的校准质量。

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来源期刊

Applied Radiation and Isotopes 工程技术-核科学技术

CiteScore

3.00

自引率

12.50%

发文量

406

审稿时长

13.5 months

期刊介绍： Applied Radiation and Isotopes provides a high quality medium for the publication of substantial, original and scientific and technological papers on the development and peaceful application of nuclear, radiation and radionuclide techniques in chemistry, physics, biochemistry, biology, medicine, security, engineering and in the earth, planetary and environmental sciences, all including dosimetry. Nuclear techniques are defined in the broadest sense and both experimental and theoretical papers are welcome. They include the development and use of α- and β-particles, X-rays and γ-rays, neutrons and other nuclear particles and radiations from all sources, including radionuclides, synchrotron sources, cyclotrons and reactors and from the natural environment. The journal aims to publish papers with significance to an international audience, containing substantial novelty and scientific impact. The Editors reserve the rights to reject, with or without external review, papers that do not meet these criteria. Papers dealing with radiation processing, i.e., where radiation is used to bring about a biological, chemical or physical change in a material, should be directed to our sister journal Radiation Physics and Chemistry.