title: Simulation of response functions of fast neutron sensors and development of thin neutron silicon sensor.
abstract: On radiation detection using silicon sensor, signals are produced from collected charges in a depletion layer; however, for high-energy particles, this depletion layer is extended due to funnelling phenomenon. The lengths of charge collection were experimentally obtained from proton peak energies in measured pulse-heights. The length is extended with increasing proton energy of up to 6 MeV, and then, is constant over 6 MeV. The response functions of fast neutron sensors were simulated for 5- and 15-MeV monoenergetic and (252)Cf neutron sources using the Monte Carlo N-Particle eXtended code. The simulation results agree well with the experimental ones, including the effect of funnelling phenomenon. In addition, a thin silicon sensor was developed for a new real-time personal neutron dosemeter. Photon sensitivity is vanishingly smaller than neutron one by a factor of 5×10(-4).
authors: National Institute of Radiological Sciences, Chiba 263-8555, Japan m_takada@nirs.go.jp.
authors: Masashi
authors: M
authors: Takada
authors: Fuji Electric Co. Ltd, Tokyo 191-8502, Japan Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan.
authors: Takashi
authors: T
authors: Nakamura
authors: Fuji Electric Co. Ltd, Tokyo 191-8502, Japan.
authors: Mikihiko
authors: M
authors: Matsuda
authors: Fuji Electric Co. Ltd, Tokyo 191-8502, Japan.
authors: Tomoya
authors: T
authors: Nunomiya
mesh_terms: D000465:Algorithms; D002142:Californium; D003198:Computer Simulation; D004583:Electrons; D006801:Humans; D009010:Monte Carlo Method; D009502:Neutrons; D016273:Occupational Exposure; D017785:Photons; D011522:Protons; D011834:Radiation Monitoring / Q000295:instrumentation* / Q000379:methods; D012825:Silicon / Q000737:chemistry*; D012984:Software; D013696:Temperature
chemical_list: D011522:Protons; D002142:Californium; D012825:Silicon