| 摘要 |
PURPOSE:To obtain the detector capable of simply measuring a neutron absorption dose becoming the basis of the evaluation of the dose equivalent of a neutron according to a direct reading system within a real time. CONSTITUTION:A collection electrode 22 is arranged in an external electrode 20 and an absorbing layer 24 (rubber containing boron B) limiting the transmission of a thermal neutron in a constant ratio is arranged on the side of the neutron incident surface of a thermal neutron detector sealed with nuclear reaction gas. A deceleration material 26 composed of polyethylene and an absorbing layer 28 are arranged on the side of the emitting surface of the thermal neutron detector and a proton recoil scintillation detector 28 is further arranged. A part of a thermal neutron transmits through the absorbing layer 24 to reach the thermal neutron detector to be detected. An epithermal neutron is decelerated by the deceleration material 26 to be converted to a thermal neutron and reaches the thermal neutron detector to be detected thereby. A fast neutron is detected by the proton recoil scitillation detector 30.
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