A Direct Comparison of Neutron Energy Spectra at High and Low Powers in the HB11 Beam at H.F.R. Petten
The energy spectrum of the HB11 neutron beam at the High Flux Reactor (HFR), Petten, has previously been measured by others by proton and ct recoil in hydrogen and helium gas proportional counters at kW power levels.1’2 This low power is required because gas counters are limited to kHz rates; it is several orders of magnitude less than the 45 MW required for therapeutic fluxes. Because of the significantly different conditions of the reactor at these two very different power levels, some doubt exists whether the spectrum remains the same at both. In order to test this point, a prototype scintillation detector, at once sensitive enough to function at low power and robust enough to handle the high rates expected at full power, has been constructed at the Paul Scherrer Institute, Villigen, Switzerland (PSI). The initial objective is to compare amplitude spectra at high and low powers in HB11, to check whether they are in fact the same shape.
KeywordsPower Level Amplitude Spectrum Neutron Beam Will Emit Paul Scherrer Institute
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