Wide-energy neutron dose equivalent rate instrument based on gamma ray energy spectrum detector

Abstract

The invention provides a wide-energy neutron dose equivalent rate instrument based on a gamma ray energy spectrum detector. The wide-energy neutron dose equivalent rate instrument comprises a sphere,the outermost layer of the sphere is a neutron non-elastic scattering material layer, and the sphere center of the sphere is provided with the gamma ray detector; a plurality of layers of neutron moderation bodies and a plurality of layers of thermal neutron capture materials are arranged between the gamma ray detector and the neutron non-elastic scattering material layer, and the neutron moderation bodies and the thermal neutron capture materials are arranged in an interlayer staggered mode; and the gamma ray detector is a lanthanum bromide detector. After neutrons enter the measurement system, instantaneous gamma rays generated by inelastic reaction or radiation capture of the neutrons and an intermediate material are detected by the gamma detector, a neutron energy spectrum can be obtained through a gamma energy spectrum unfolding technology, and finally the neutron energy spectrum is converted into a neutron dose equivalent rate.

Description

Technical field: [0001] The invention belongs to the technical field of radiation measurement, in particular to a wide-energy neutron dose equivalent rate meter based on a gamma-ray energy spectrum detector. Background technique: [0002] A neutron dose rate meter is a radiation monitoring device used to measure and evaluate the surrounding dose equivalent rate produced by neutron radiation. At present, the basic components of common neutron dose rate meters for radiation protection include moderators, neutron energy compensation materials, thermal neutron sensitive counters and electronic circuits. Its structural feature is that the thermal neutron sensitive counter is wrapped in the center with a spherical or cylindrical moderator; in the moderator body, a neutron absorption sieve with slow neutron penetration holes is set at a certain distance from the central detector. Or use the absorption layer of boron-containing material, the incident neutrons are moderated (or ther...

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Problems solved by technology

However, each method has limitations. The neutron activation method uses a series of activation foils with a reaction threshold to operate, which is complicated to operate and cannot be measured online; the recoil proton method is suitable for the measurement of fast neutrons, and the thermal neutron measurement capability Insufficient; the principle of the time-of-flight method is simple, but the equipment system is complex, and it is only suitable for pulsed neutron source measurement, and has strict requirements on the direction of incident neutrons, and the system efficiency is low; multi-sphere neutron spectrometers need to perform multiple measurements , unable to measure the transient neutron energy spectrum, and the operation is more cumbersome

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