GaAs Schottky Barrier Detectors for Alpha-Particle Spectrometry at Temperatures up to 120°C

Alexey V. Chernykh, Sergey V. Chernykh, Sergey I. Didenko, Н. Буртебаев, Maulen Nasurlla, Marzhan Nasurlla, G.I. Britvich, А. П. Чубенко, F. Baryshnikov, E. V. Sleptsov

2018

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DOI 10.1134/s106378501810019x

Data confidence 70 medium

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Abstract

GaAs Schottky barrier detectors for α particle spectrometry have been tested. Detectors had an input window area of 80 mm 2 and a working barrier layer thickness of 40–50 μm. The energy resolution (FWHM) measured on 5.499 MeV α line of 238 Pu source amounted to 17.5 keV at a generator peak width of 7.8 keV. In the measurements on a 226 Ra source, detectors showed linear response and nearly 100% charge collection efficiency at reverse bias above 65 V for all energies of α particles emitted from the source. Tests for thermal stability showed that the proposed detectors can be used in alpha-spectrometry of radionuclides at temperatures up to 120°C.