Neutron detector

Abstract

The invention provides a neutron detector, comprising a neutron absorbing crystal, a first photoelectric converter, a second photoelectric converter, a first pulse discrimination circuit, a second pulse discrimination circuit, a time-coincidence circuit and a counting system; wherein the first photoelectric converter and the second photoelectric converter are coupled with the neutron absorbing crystal; the first pulse discrimination circuit is used for carrying out amplitude discrimination on a first electric signal generated by the first photoelectric converter; the second pulse discrimination circuit is used for carrying out amplitude discrimination on a second electric signal generated by the second photoelectric converter; the time-coincidence circuit is used for determining whether time windows of the first electric signal and the second electric signal subjected to amplitude discrimination are the same, and if so, generating a determination effective signal; and the counting system is connected with the time coincidence circuit and triggered to count by the determination effective signal. According to the neutron detector provided by the invention, interference caused by gamma ray can be reduced even avoided.

Description

technical field [0001] The invention relates to electronic instrument technology, in particular to a neutron detector. Background technique [0002] The neutron detectors in the prior art often adopt the structure of coupling 6-LiI crystal and PIN photodiode. This combined structure has the advantages of small size, high sensitivity, low power consumption, low cost, etc., and is especially suitable for small handheld Sub-detection instrumentation. [0003] figure 1 A schematic diagram of the structure of a traditional neutron detector is shown, including: 6-LiI crystal 10, which has a packaging shell 101 and a light-emitting surface 102 on the outside, when neutrons enter the 6-LiI crystal 10, they will be captured and Generate an optical signal; PIN photodiode 11 is coupled with the light-emitting surface 102 of the 6-LiI crystal 10, and converts the optical signal emitted from the light-emitting surface 102 into an electrical signal; the amplifier circuit 12 amplifies th...

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Problems solved by technology

[0005] However, it is also possible that the gamma ray is directly incident on the PIN photodiode 11 and generates an electrical signal, and the pulse amplitude of the electrical signal formed by the incident gamma ray of the same energy on the PIN photodiode 11 is relatively large, which is why it is incident on the 6-LiI crystal 10 The amplitude of the generated electrical signal pulse is more than several times, which is similar to the amplitude of the electrical signal pulse generated by neutrons incident on the 6-LiI crystal 10, so it cannot be eliminated by amplitude screening, causing interference to the neutron counting in the detection process

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