title: A scintillation spectrometer for direct comparison of neutron energy spectra at high and low rates.
abstract: The energy spectrum of the HB11 beam at HFR, Petten, has previously been measured by proton and alpha recoil in hydrogen and helium gas proportional counters at power levels of a few kW. There is some doubt whether the spectrum remains the same at the much higher power of 45 MW required for therapeutic fluxes. In order to test this point, a scintillation detector has been developed at the Paul Scherrer Institute, Villingen, Switzerland. While the device is again based on the proton recoil reaction, a combination of mm-sized plastic scintillators and fast electronics will allow it to operate at both a few kW and 45 MW, permitting direct comparison of energy spectra at these very different power levels. Results of preliminary tests at LFR, Petten, are presented.
authors.affiliation: Paul Scherrer Institute, Villingen, Switzerland.
authors.forename: J F
authors.initials: JF
authors.lastname: Crawford
authors.forename: M W
authors.initials: MW
authors.lastname: Konijnenberg
authors.forename: C A
authors.initials: CA
authors.lastname: Perks
authors.forename: F
authors.initials: F
authors.lastname: Stecher-Rasmussen
authors.forename: P R
authors.initials: PR
authors.lastname: Watkins
mesh_terms: D006801:Humans; D017247:Neutron Capture Therapy / Q000295:instrumentation* / Q000379:methods; D012588:Scintillation Counting / Q000295:instrumentation*