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Fiber-coupled organic plastic scintillator for on-line dose rate monitoring in 6 MV X-ray beam for external radiotherapy

机译：光纤耦合有机塑料闪烁体，可在线监测6 MV X射线束中的剂量率，以进行外部放射治疗

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摘要

Fiber-coupled organic plastic scintillators enable on-line dose rate monitoring in conjunction with pulsed radiation sources like linear medical accelerators (linacs). The accelerator, however, generates a significant amount of stray ionizing radiation. This radiation excites the long optical fiber (15-20 m), connecting the scintillator, typically with a diameter of 1 mm and 5 mm in length, with the optical detector circuit, causing parasitic luminescence in the optical fiber. In this paper we propose a method for circumventing this problem. The method is based on the use of an organic scintillator, 2-Naphthoic acid, doped in an optical polymer. The organic scintillator possesses a long luminescent lifetime (room temperature phosphorescence). The scintillator is molded onto the distal end of a polymer optical fiber. The luminescent signal from the scintillator is detected by a PMT in photon-counting mode.rnThe long lifetime of the scintillator signal facilitates a temporal gating of the dose rate signal with respect to the parasitic luminescence from the optical fiber. We will present data obtained using a solid water phantom irradiated with 6 MV X-rays from a medical linac at the Copenhagen University Hospital. Also issues pertaining to the selection of proper matrix as well as phosphorescent dye will be presented in this paper.
机译：纤维耦合有机塑料闪烁体可与线性医疗加速器（直线加速器）之类的脉冲辐射源一起实现在线剂量率监测。但是，加速器会产生大量的杂散电离辐射。该辐射激发长光纤（15-20 m），将闪烁器（通常直径为1 mm和长度为5 mm）与光学检测器电路连接，从而导致光纤中的寄生发光。在本文中，我们提出了一种解决此问题的方法。该方法基于使用掺杂在光学聚合物中的有机闪烁体2-萘甲酸。有机闪烁体具有长的发光寿命（室温磷光）。闪烁体模制在聚合物光纤的远端上。来自闪烁体的发光信号由PMT在光子计数模式下检测。闪烁体信号的长寿命有助于剂量率信号相对于来自光纤的寄生发光进行时间选通。我们将展示使用从哥本哈根大学医院的医疗直线加速器照射6 MV X射线的固体水幻影获得的数据。本文还将介绍与选择合适的基质以及磷光染料有关的问题。

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