An attempt to decrease anisotropic emissions of neutrons from a cylindrical 241Am-Be-encapsulation source.
An attempt to decrease the anisotropic emissions of neutrons from a cylindrical (241)Am-Be-encapsulated X3 source was conducted with Monte Carlo calculations and experiments. The influence of metal materials and shapes of the external casing to the anisotropy factor were focussed on. Results obtained by calculations using MCNP4C implied that a light and spherical-shaped external casing decreases the anisotropic emission of neutrons. Experimental results using the spherical-shaped aluminium protection case also revealed that the anisotropy factor was close to 1.0 with wide zenith angle ranges.
Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan kowatari.munehiko@jaea.go.jp.
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Kowatari
Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan.
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Tanimura
Department of Radiation Protection, Nuclear Science Research Institute, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki 319-1195, Japan.
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Yoshizawa
D000535:Aluminum / Q000737:chemistry; D000576:Americium; D016880:Anisotropy; D001608:Beryllium; D002138:Calibration; D004867:Equipment Design; D007564:Japan; D008670:Metals / Q000737:chemistry; D009010:Monte Carlo Method; D009502:Neutrons; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D012542:Scattering, Radiation
D008670:Metals; D000535:Aluminum; D001608:Beryllium; D000576:Americium