Neutron detector for atomic reactor

Abstract

Abstract PURPOSE:To enable to confirm, with an ordinary measuring board, activation amount after the use of a detector by providing a neutron sensitive substance in such a way as to generate inside the detector a neutron source corresponding to the neutron amount received by the detector itself. CONSTITUTION:If a mixture 22 of antimony and berylium arranged inside a detector is irradiated with neutron, <123>SB(n, r) and <124>Sb are subjected to bets decay into <124>T(e) for emitting <124>T(e), and gamma rays emitted from the <124>T(e) cause <9>B(e) to generate neutrons with photonuclear reaction of <9>B(e)(r, n) <3>B(e). An amount of neutron generated by this nuclear reaction forms a formula, closely relating to the amount of neutron the mixture 22 received. In the formula, A is the amount of generated neutron, B is the amount of neutron irradiated, T<1> is irradiation period, T2 is time after an atomic reactor shutdown, and alphaand beta are constants determined depending upon decayed nucleides. Normally, alphaand beta are known values while T1 and T2 are also known values. And, A can be obtained by measuring while B becomes computable. In other words, if an amount of neutron is obtained, the activation amount can be computed from components of detector constituting members.

Inventors

• 👤 Masakazu Tamura
• 👤 政和 田村

Bibliographic Details