Abstract—

A spectrometer based on a Si(Li) detector has been tested by exposure to α particles with the aim of determining changes in the detector characteristics versus the fluence. As a result of 60-day measurements with a total fluence of 6.2 × 10⁹ α particles, it has been established that the dependence of the deterioration in the energy resolution of α-particle peaks on the fluence is described by a linear function with a slope of Δσ/ΔФ = (8.4 ± 0.4) × 10^–10 keV/α. The measured amplitude of the α-particle momentum decreases linearly with increasing fluence with a slope of (–4.8 ± 0.6) × 10^–9 keV/α. These effects do not prevent reliable discrimination between the signals from α particles and fission fragments until the fluence reaches a value of 10¹⁰ α particles when the Si(Li) detector is a part of a neutron source for detecting fission fragments.

中文翻译：

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暴露于α粒子下的Si（Li）检测器参数的变化

摘要-

基于Si（Li）检测器的光谱仪已通过暴露于α粒子进行了测试，目的是确定检测器特性相对于注量的变化。由于60天测量结果与6.2×10的总通量的结果⁹ α粒子，已经确定，在的α粒子的峰的能量分辨率上的注量的劣化的依赖性是通过用一个线性函数描述Δσ/ΔФ的斜率=（8.4±0.4）×10 ^–10 keV /α。α粒子动量的测量幅度随注量的增加而线性减小，斜率为（–4.8±0.6）×10 ^–9 keV /α。这些影响不会阻止能量密度达到10 ¹⁰值之前可靠区分来自α粒子和裂变碎片的信号的能力。当Si（Li）探测器是用于探测裂变碎片的中子源的一部分时，α粒子。