title: Construction of 144, 565 keV and 5.0 MeV monoenergetic neutron calibration fields at JAERI.
abstract: Monoenergetic neutron calibration fields of 144, 565 keV and 5.0 MeV have been developed at the Facility of Radiation Standards of JAERI using a 4 MV Pelletron accelerator. The 7Li(p,n)7Be and 2H(d,n)3He reactions are employed for neutron production. The neutron energy was measured by the time-of-flight method with a liquid scintillation detector and calculated with the MCNP-ANT code. A long counter is employed as a neutron monitor because of the flat response. The monitor is set up where the influence of inscattered neutrons from devices and their supporting materials at a calibration point is as small as possible. The calibration coefficients from the monitor counts to the neutron fluence at a calibration point were obtained from the reference fluence measured with the transfer instrument of the primary standard laboratory (AIST), a 24.13 cm phi Bonner sphere counter. The traceability of the fields to AIST was established through the calibration.
authors.affiliation: Japan Atomic Energy Research Institute, Tokai-mura, Naka-gun, Ibaraki, 319-1195, Japan. tanimura@popsvr.tokai.jaeri.go.jp
authors.forename: Y
authors.initials: Y
authors.lastname: Tanimura
authors.forename: M
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: J
authors.initials: J
authors.lastname: Saegusa
authors.forename: K
authors.initials: K
authors.lastname: Fujii
authors.forename: S
authors.initials: S
authors.lastname: Shimizu
authors.forename: M
authors.initials: M
authors.lastname: Yoshida
authors.forename: Y
authors.initials: Y
authors.lastname: Shibata
authors.forename: A
authors.initials: A
authors.lastname: Uritani
authors.forename: K
authors.initials: K
authors.lastname: Kudo
mesh_terms: D000465:Algorithms; D002138:Calibration / Q000592:standards; D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis / Q000379:methods / Q000592:standards*; D005214:Fast Neutrons; D007564:Japan; D008956:Models, Chemical; D009010:Monte Carlo Method; 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