title: CHARACTERIZATION OF A THIN SILICON SENSOR FOR ACTIVE NEUTRON PERSONAL DOSEMETERS.
abstract: A thin silicon sensor has been developed for active neutron personal dosemeters for use by aircrews and first responders. This thin silicon sensor is not affected by the funneling effect, which causes detection of cosmic protons and over-response to cosmic neutrons. There are several advantages to the thin silicon sensor: a decrease in sensitivity to gamma rays, an improvement of the energy detection limit for neutrons down to 0.8 MeV and an increase in the sensitivity to fast neutrons. Neutron response functions were experimentally obtained using 2.5 and 5 MeV monoenergy neutron beams and a (252)Cf neutron source. Simulation results using the Monte Carlo N-Particle transport code agree quite well with the experimental ones when an energy deposition region shaped like a circular truncated cone is used in place of a cylindrical region.
authors.affiliation: National Defense Academy, Yokosuka 239-8686, Japan takada@nda.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Takada
authors.affiliation: Fuji Electric Co., Ltd., Hino, Tokyo 191-8502, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nunomiya
authors.affiliation: Fuji Electric Co., Ltd., Hino, Tokyo 191-8502, Japan Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8579, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Masuda
mesh_terms: D000465:Algorithms; D002142:Californium; D003198:Computer Simulation; D003359:Cosmic Radiation; D005214:Fast Neutrons; D005720:Gamma Rays; D006801:Humans; D009010:Monte Carlo Method; D009502:Neutrons; D016273:Occupational Exposure / Q000032:analysis; D020959:Polyethylene; D011829:Radiation Dosage; D000072232:Radiation Dosimeters; D011835:Radiation Protection; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D012825:Silicon / Q000737:chemistry*; D012984:Software
chemical_list: D020959:Polyethylene; D002142:Californium; D012825:Silicon