title: In situ neutron spectrometry to 60 MeV in a water phantom exposed to a cancer therapy beam.
abstract: In-air and in-phantom neutron spectra have been measured between 10 and 60 MeV for two field sizes on the Clatterbridge cyclotron by unfolding the response of a specially built NE213 scintillator. The in-phantom measurements show distinct spectral hardening with depth, which is reflected in changes in the spectrum-averaged mean neutron energy. These findings are confirmed using Monte Carlo calculations.
authors.affiliation: Medical Physics Group, School of Physics and Space Research, University of Birmingham, UK.
authors.forename: N M
authors.initials: NM
authors.lastname: Crout
authors.forename: J G
authors.initials: JG
authors.lastname: Fletcher
authors.forename: S
authors.initials: S
authors.lastname: Green
authors.forename: M C
authors.initials: MC
authors.lastname: Scott
authors.forename: G C
authors.initials: GC
authors.lastname: Taylor
mesh_terms: D005214:Fast Neutrons; D006801:Humans; D008961:Models, Structural; D009369:Neoplasms / Q000532:radiotherapy; D010315:Particle Accelerators; D011882:Radiotherapy, High-Energy; D013057:Spectrum Analysis; D014867:Water
chemical_list: D014867:Water