Helium-filled proportional counter for low-temperature operation (1.75–4.2 K) and its application to cryogenic resonance-electron Mössbauer spectroscopy II

Abstract
The operation of the helium-filled proportional counter (HFPC) has been investigated at low temperatures below liquid-helium temperature, 4.2 K. It has been found that the gas gain as a function of the anode voltage is not appreciably changed by the temperature of the filling gas, but continuous electric discharges are induced at lower anode voltages as the gas temperature is decreased. The present counter technique has been applied to resonance-electron Mössbauer spectroscopy in the temperature region below 4.2 K.

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