title: Photon doses in NPL standard neutron fields.
abstract: Standard neutron fields are invariably accompanied by a photon component due to the neutron-generating reactions and secondary neutron interactions in the surrounding environment. A set of energy-compensated Geiger-Müller (GM) tubes and electronic personal dosemeters (EPDs) have been used to measure the photon dose rates in a number of standard radionuclide and accelerator-based neutron fields. The GM tubes were first characterised in standard radioisotope and X-ray photon fields and then modelled using MCNP to determine their photon dose response as a function of energy. Values for the photon-to-neutron dose equivalent ratios are presented and compared with other published values.
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK neil.roberts@npl.co.uk.
authors.forename: N J
authors.initials: NJ
authors.lastname: Roberts
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
authors.forename: N A
authors.initials: NA
authors.lastname: Horwood
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, UK.
authors.forename: C J
authors.initials: CJ
authors.lastname: McKay
mesh_terms: D002138:Calibration; D002142:Californium; D004566:Electrodes; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009502:Neutrons; D010315:Particle Accelerators; D017785:Photons; D011829:Radiation Dosage; D011868:Radioisotopes / Q000737:chemistry; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D014965:X-Rays
chemical_list: D011868:Radioisotopes; D002142:Californium