一种多阳极电离室的性能测试及初步应用
Performance Testing and Primary Use of Multi-anode Gas Ionization Chamber
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摘要: Bragg峰表征了带电粒子在介质中的能量沉积特性，通过分析带电粒子的分布和锐度可确定其在介质中的能量分布特征和单色性。本文介绍了一种能够快速探测带电粒子束在自由空气中形成的Bragg峰的多阳极电离室的设计原理、性能测试及初步应用。在90Sr-90Y源形成的β射线场中初步测出了电离室在自由空气中的电压-电流饱和特性、测量的重复性和稳定性，并测出241Am源产生的α粒子在自由空气中的射程。初步实验结果表明：该电离室具有良好的饱和特性、测量稳定性和重复性，用它测出的α粒子在空气中的射程与SRIM程序模拟结果能够很好地符合。Abstract: The Bragg peak indicates the energy deposition characteristics of the charged-particle in a medium. The energy contribution and the monochromaticity of the charged-particle beams can be determined by analyzing their distribution and sharpness. The article introduces the design principle, performance testing and pilot use of a multi-anode gas ionization chamber, which can detect the Bragg peak generated in free air quickly. The voltage-current characteristics, the measurement repeatability and stability were all measured in a 90Sr-90Y β reference field. The primary experiment results indicate that the chamber has good saturation characteristic, repeatability and stability, and the measured range of α particle generated by 241Am source is well coincided with the simulated results made by SRIM code.
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Keywords:
- multi-anode gas ionization chamber ,
- saturation characteristic ,
- Bragg peak ,
- range
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