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首页> 外文学位 >The radiation dosimetry of a quartz viewer irradiated with a 4.5 MeV proton beam.
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The radiation dosimetry of a quartz viewer irradiated with a 4.5 MeV proton beam.

机译：用4.5 MeV质子束照射的石英观测器的辐射剂量。

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The present dissertation describes a procedure to measure the radiation dose received by an accelerator operator who uses a quartz viewer to locate an ion beam. This procedure consists of the following steps: (i) A solid-state gamma radiation detector was calibrated to determine its efficiency and its energy scale. (ii) The calibrated detector was used to measure the gamma energy spectrum obtained when bombarding the viewer with the ion beam. This measurement was normalized, that is, beam current and measurement duration were determined. (iii) Individual gamma energy lines were extracted from the gamma spectrum and the respective energies and emission rates were obtained. Energies were checked with known transitions in silicon and oxygen, to ensure correct identification. (iv) The Compton gamma energy spectrum generated by the primary gamma rays was determined using a Compton code. (v) Finally the charged-ion bremsstrahlung spectrum was obtained using the formalism of Alder et. al.; In this dissertation several prospective contributors to the radiation dose have been checked and were found to be insignificant. They were: the radiation dose due to x-rays generated by Compton electrons and the radiation dose generated by electrons produced by collisions with the incident ions. With a proton energy of 4.5 MeV the eye dose equivalent was determined at 0 and 90 degrees to the proton beam. At 0 degree with a proton fluence rate of 8.9 × 1011 protons/s the dose was 8.7 × 10−3 rem/hr. At 90 degrees with a proton fluence rate of 1.1 × 1012 protons/s the dose was 8.1 × 10−3 rem/hr.
机译：本发明描述了一种测量由加速器操作员接收的辐射剂量的程序，该加速器操作员使用石英观察器来定位离子束。该程序包括以下步骤：（i）对固态伽马辐射探测器进行校准以确定其效率和能级。 （ii）校准的检测器用于测量用离子束轰击观察者时获得的伽马能谱。对该测量进行归一化，即确定束电流和测量持续时间。 （iii）从伽马光谱中提取出单独的伽马能谱线，并获得了各自的能量和发射率。用已知的硅和氧跃迁检查能量，以确保正确识别。 （iv）由主要伽马射线产生的康普顿伽马能谱是使用康普顿码确定的。 （v）最后使用Alder等人的形式学方法获得带电离子ion致辐射谱。 al .;在本文中，已经检查了辐射剂量的几个预期贡献者，并且发现它们是无关紧要的。它们是：由康普顿电子产生的 x 射线引起的辐射剂量和与入射离子碰撞产生的电子产生的辐射剂量。在质子能量为4.5 MeV的情况下，确定了与质子束成0度和90度的等效眼剂量。在0度下，质子通量率为8.9×10 11 质子/ s，剂量为8.7×10 -3 rem / hr。在90度下，质子通量率为1.1×10 12 质子/秒，剂量为8.1×10 -3 rem / hr。

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