Investigation of the Pulse Shape in a He-3 Counter under Neutron Irradiation

摘要

The shape of pulses produced in a He-3 counter by thermal neutrons has been investigated. The electronics, which consist of a charge-sensitive preamplifier and a shaping amplifier, have been developed. The measured pulse shape is compared to the result of simulation of the He-3 counter signals under neutron irradiation. A new method for determining the pressure in a He-3 counter is proposed that is based on measurements of the total charge-collection efficiency and the maximum effective pulse width in the counter. This method is in good agreement with the direct measurement of the pressure in a He-3 counter using the transmission method.