A Change in the Parameters of Si(Li) Detectors under Exposure to α Particles

N. V. Bazlov, S. V. Bakhlanov, A. V. Derbin, I. S. Drachnev, G. A. Izegov, I. M. Kotina, V. N. Muratova, N. V. Niyazova, D. A. Semenov, M. V. Trushin, E. V. Unzhakov, E. A. Chmel

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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.

Original languageEnglish
Pages (from-to)25-29
Number of pages5
JournalInstruments and Experimental Techniques
Issue number1
StatePublished - 1 Jan 2020

Scopus subject areas

  • Instrumentation


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