title: Conceptual design of spectrum changeable neutron calibration fields in JAERI/FRS.
abstract: Spectrum changeable neutron calibration fields are planned to be established with an accelerator installed in Japan Atomic Energy Research Institute/Facility of Radiation Standards. The neutron fields are provided by bombarding a target surrounded by a moderator, with charged particles from the accelerator. In the fields, a wide variety of neutron spectra is provided with sufficient fluence rate for the calibration of dosemeters. In this study, necessity of the field was first discussed in view of relationship between readings of existing dosemeters and true dose equivalents where the dosemeters were used. Second, test simulation of neutron spectra was carried out with the Monte Carlo technique for some arrangements with a LiF target and quasi-cylindrical moderators with different materials. The simulated spectra were summarised in terms of fluence-average energy, fluence rate and calibration factor for the dosemeters.
authors.affiliation: Department of Health Physics, Japan Atomic Energy Research Institute (JAERI), Tokai, Ibaraki 319-1195, Japan. saegusa@popsvr.tokai.jaeri.go.jp
authors.forename: J
authors.initials: J
authors.lastname: Saegusa
authors.forename: Y
authors.initials: Y
authors.lastname: Tanimura
authors.forename: M
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: M
authors.initials: M
authors.lastname: Yoshida
mesh_terms: D000465:Algorithms; D002138:Calibration; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis / Q000379:methods / Q000592:standards; D007564:Japan; D008956:Models, Chemical; D009010:Monte Carlo Method; D009502:Neutrons; D011829:Radiation Dosage; D011835:Radiation Protection / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D011868:Radioisotopes / Q000032:analysis; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods / Q000592:standards*; D012015:Reference Standards; D012542:Scattering, Radiation
chemical_list: D011868:Radioisotopes