• 主页
  • 查找结果
  • Comparison between TG-51 and TRS-398: electron contamination effect on photon beam-quality specification.

Comparison between TG-51 and TRS-398: electron contamination effect on photon beam-quality specification.

Physics in medicine and biology (2004-02-20)
Antonio Lopez Medina, Antonio Teijeiro, Francisco Salvador, Daniela Medal, Julio Vazquez, Manuel Salgado, María C Carrion
摘要

Two dosimetry protocols based on absorbed dose to water have recently been implemented: TG-51 and TRS-398. These protocols use different beam-quality indices: %dd(10)x and TPR20,10. The effect of electron contamination in measurements of %dd(10)x has been proposed as a disadvantage of the TG-51. For actual measurements of %dd(10)x in five clinical beams (Primus 6-18 MV, SL-75/5 6 MV, SL-18 6-15 MV) a purging magnet was employed to remove the electron contamination. Also, %dd(10)x was measured in the different ways described in TG-51 for high-energy beams: with a lead foil at 50 cm from the phantom surface, at 30 cm, and for open beam. Moreover, TPR20,10 was determined. Also, periodic quality-control measurements were used for comparing both quality indices and variation over time, but D20,10 was used instead of TPR20,10 and measurements in open beam for the %dd(10)x determination. Considering both protocols, S(w,air) and kQ were calculated in order to compare the results with the experimental data. Significant differences (0.3% for kQ) were only found for the two high-energy beams, but when the electron contamination is underestimated by TG-51, the difference in kQ is lower. Differences in the other cases and variations over time were less than 0.1%.

材料
货号
品牌
产品描述

铅, foil, 150x150mm, thickness 0.5mm, as rolled, 99.95%
铅, foil, 50x50mm, thickness 0.25mm, as rolled, 99.95%
铅, foil, 50x50mm, thickness 0.1mm, as rolled, 99.95%
铅, foil, 100x100mm, thickness 3.0mm, as rolled, 99.95%
铅, foil, 100x100mm, thickness 3.0mm, as rolled, 99.99+%
铅, foil, 100x100mm, thickness 6.0mm, as rolled, 99.99+%
铅, foil, 150x150mm, thickness 0.125mm, as rolled, 99.95%
铅, foil, 150x150mm, thickness 0.15mm, as rolled, 99.95%
铅, foil, 150x150mm, thickness 0.1mm, as rolled, 99.95%
铅, foil, 150x150mm, thickness 0.25mm, as rolled, 99.95%
铅, foil, 150x150mm, thickness 0.55mm, as rolled, 99.999%
铅, foil, 150x150mm, thickness 1.0mm, as rolled, 99.5%
铅, foil, 150x150mm, thickness 1.0mm, as rolled, 99.95%
铅, foil, 250x250mm, thickness 3.0mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.125mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.125mm, as rolled, 99.99+%
铅, foil, 25x25mm, thickness 0.15mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.1mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.25mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.25mm, as rolled, 99.99+%
铅, foil, 25x25mm, thickness 0.55mm, as rolled, 99.999%
铅, foil, 25x25mm, thickness 0.5mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 0.5mm, as rolled, 99.99+%
铅, foil, 25x25mm, thickness 1.0mm, as rolled, 99.5%
铅, foil, 25x25mm, thickness 1.0mm, as rolled, 99.95%
铅, foil, 25x25mm, thickness 1.0mm, as rolled, 99.99+%
铅, foil, 25x25mm, thickness 1.5mm, as rolled, 99.99+%
铅, foil, 25x25mm, thickness 3.0mm, as rolled, 99.99+%
铅, foil, 300x300mm, thickness 0.125mm, as rolled, 99.95%
铅, foil, 300x300mm, thickness 0.15mm, as rolled, 99.95%

社交媒体

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon

Merck

科研、开发、生产。

作为生命科学行业的全球领先供应商,我们致力于为科研、生物技术开发和生产,以及制药药物疗法开发和生产提供各类解决方案和服务。

© 2021年版权归德国达姆施塔特默克集团(Merck KGaA)及/或其附属公司所有。版权所有。

未经许可,严禁复制本网站上的任何资料。