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    • 7. 发明专利
    • SHIELDING BODY AGAINST THERMAL NEUTRON
    • JPH04102096A
    • 1992-04-03
    • JP21892990
    • 1990-08-22
    • NIPPON KOKAN KK
    • KIKUCHI HITOSHI
    • G21F1/00G21F3/00
    • PURPOSE:To contrive the reduction of generation of a secondary gamma-ray of high energy by dispersing particles containing a thermal neutron absorbing element for absorbing thermal neutrons in a resin which does not contain a secondary gamma-ray generating element of high energy generating the secondary gamma-ray of high energy when the thermal neutrons are captured. CONSTITUTION:A fluororesin such as Teflon is used in a matrix on a neutron shielding layer 23 and a boron compound (B4C particle) dispersed to form as particles containing a thermal neutron absorbing element in a resin. A shield shutter 13 is opened to irradiate a test specimen 14 with thermal neutrons 6 through a conduit 12 from a heavy water tank so as to expose an exposure plate 15 by the use of transmitted neutrons 6. When the neutrons 6 strike B4C particles contained in a shield member 16, the B4C particles captures them and a secondary gamma-ray 7 of low energy is released instead. Since the retained energy of the ray 7 is about 0.5MeV, it can be shielded by the use of an outside gamma-ray shielding layer 24. In addition, since hydrogen is not contained in the matrix of the shielding layer 23, the secondary gamma ray of high energy is not generated.