The neutron sensitivity of a Geiger-Müller counter between 0.5 and 8 MeV

Geiger-Müller counters are often used in mixed-field dosimetry to determine the photon dose fraction. For accurate dose specification, their neutron sensitivities must be known. The pulsed beam time-of-flight method was used to determine the neutron sensitivities of an energy-compensated type ZP1320/PTFE Geiger-Müller counter in the 0.5-8-MeV region. The flux of monoenergetic neutrons from the T(p,n)3He and D(d,n)3He reactions, which were used in these measurements, was determined from time-of-flight spectra with an NE213 scintillation counter of known efficiency.