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研究28 MeV质子对拉塞纳单立体主动像素传感器辐射损伤的研究

L Beck¹, C De Sio¹, J Pritchard¹

¹School of Physics, University of Bristol, Bristol BS8 1TL, UK.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|June 21, 2025

概括

拉塞纳辐射疗法验证装置,单立体主动像素传感器 (MAPS),在不冷却的情况下显示出高达20kGy的出色性能. 随着冷却,它保持高达50kGy的功能,确保可靠的临床操作.

科学领域:

医学物理医学物理
辐射检测辐射检测辐射检测
半导体设备半导体设备

背景情况:

实时验证设备对于放射治疗的准确性至关重要.
单立体主动像素传感器 (MAPS) 为此类应用提供了潜力.
了解辐射对MAPS的影响对于设备的寿命至关重要.

研究的目的:

为了评估拉塞纳MAPS设备的辐射硬度.
为了确定在质子辐射下拉塞纳传感器的操作极限.
评估传感器是否适合用于临床放射治疗验证.

主要方法:

辐射两个拉塞纳传感器的28 MeV质子,达到50 kGy.
测量传感器性能,包括泄漏电流,动态范围和噪声.
评估多叶聚合器 (MLC) 在辐射后的叶子位置分辨率.

主要成果:

质子辐射增加了泄漏电流,减少了动态范围,增加了噪声.
传感器的性能仍然足够用于临床使用,高达20kGy,不需要冷却.
在MLC中,叶子位置分辨率为<60μm (<10kGy) 和~130μm (1620kGy).
冷却可使运行高达50kGy;没有冷却,和发生在20kGy以上.

结论:

拉塞纳MAPS设备在放射治疗验证中表现出强大的性能.
通过冷却,传感器适用于高达50kGy的辐射剂量.
没有冷却,传感器可提供大约1-2年的临床运行,足以监测质子疗法.

关键词:

单立式活跃像素传感器质子剂量是一个质子剂量.辐射损伤辐射损伤用于医疗应用的辐射探测器

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