The distribution of the ionization pulse amplitudes in ionization fission chamber due to the fission fragments spread in terms of their charge, mass, and energy
In the present paper, the distribution of the ionization pulse amplitudes in a fission chamber (FC) due to the spread of fission fragments in terms of their charge, mass and energy is considered for different neutron flux spectra. The estimates are implemented by means of the programs: (i) GEF describing the nuclear fission processes and (ii) SRIM used to calculate the energy losses of ions in the matter. The obtained results demonstrate that the empirical distribution function of ionization pulse amplitudes has two maxima, being practically independent of the types of a neutron flux spectrum. This result allows us to conclude that neutrons with different spectra may be used to calibrate a pulsed mode FC. This should greatly simplify the calibration process for such cameras.