Neutron-sensitive substance plutonium-doped plastic scintillator and thermal neutron measurement method thereof

The invention belongs to the radiation measurement field and relates to a neutron-sensitive substance plutonium-doped plastic scintillator and a thermal neutron measurement method thereof. According to the neutron-sensitive substance plutonium-doped plastic scintillator and the thermal neutron measurement method thereof of the invention, a plastic scintillator is doped with a plutonium-containing raw material; the plutonium-doped plastic scintillator is connected with a photomultiplier tube, and the plutonium-doped plastic scintillator and the photomultiplier tube are sealed in an opaque shell, so that a probe can be formed; the probe is arranged in a measurement environment; incoming neutrons and the plutonium-containing raw material in the plastic scintillator are subjected to a nuclear reaction, so that the material is in an excited state; after the material is de-excited, photons are released; the number of the photons is proportional to the number of the incoming neutrons; the quantity of the electric pulse signals of the photomultiplier tube in unit time is recorded, so that the fluence of the neutrons can be obtained, and therefore, the measurement of the fluence of the neutrons can be realized; and the fluence of the neutrons is multiplied by a fluence-dose conversion coefficient, so that the equivalence of the dose of the neutrons can be obtained. The neutron-sensitive substance plutonium-doped plastic scintillator of the invention has the advantages of low cost, wide application range and high detection efficiency.