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首页> 外文期刊>World Journal of Nuclear Science and Technology >The Calibration and Use of a New Ring-Shaped Ionization Chamber for Monitoring and Dosimetry of X-Ray Beams
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The Calibration and Use of a New Ring-Shaped Ionization Chamber for Monitoring and Dosimetry of X-Ray Beams

机译：新型环形电离室用于X射线束监测和剂量测定的校准和使用

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摘要

Today, dosimeters are used generally for dosimetry of the diagnostic X-ray beam. Ionization chambers are appropriate instruments for monitoring and also the dosimetry of X-ray beam in medical diagnostic equipment. The present work introduces design and investigation of a new ring-shaped monitor chamber with a PMMA body, graphite-coated PMMA windows (0.5 mm thick), a special graphite-foil central electrode (0.1 mm thick, 0.7 g/cm3 dense) that creating two sensitive volumes and a central hole for crossing the radiation beam with less attenuation. The results of performance tests conducted at the Nuclear Science and Technology Research Institute, AEOI in Karaj- Iran proved the high short and long-term stability, the very low leakage current, the low directional dependence and very high ion collection efficiency through the special design of the collecting electrode. Moreover, the FLUKA Monte Carlo simulations certified the negligible effect of central electrode on this new ring-shaped monitor chamber. According to the results of the performance tests, the new monitor chamber can be used as a standard dosimeter in order to monitor X-ray beam in primary standard dosimetry laboratories.
机译：如今，剂量计通常用于诊断X射线束的剂量测定。电离室是用于监视的适当仪器，也是医疗诊断设备中X射线束剂量的合适仪器。本工作介绍了一个新的环形监测室的设计和研究，该监测室具有PMMA主体，石墨涂层的PMMA窗口（0.5毫米厚），特殊的石墨箔中央电极（0.1毫米厚，0.7 g / cm3密度），产生两个敏感的体积和一个中心孔，以较小的衰减越过辐射束。通过特殊设计，在伊朗Karaj的AEOI核科学技术研究院进行的性能测试结果证明，其高短期和长期稳定性，极低的泄漏电流，低的方向依赖性以及极高的离子收集效率收集电极的此外，FLUKA蒙特卡洛模拟法证明了中央电极对这种新型环形监测室的影响可忽略不计。根据性能测试的结果，新的监控室可用作标准剂量计，以便在主要的标准剂量测定实验室中监控X射线束。

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