Neutron detector

A detector and neutron technology, applied in the field of electronic instruments, can solve problems such as neutron counting interference, and achieve the effect of avoiding interference

Inactive Publication Date: 2012-05-09
RAE SYST SHANGHAI
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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 cryst

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Embodiment Construction

[0026] In the neutron detector in the prior art, if the gamma ray is directly incident on the PIN photodiode, the amplitude of the electrical signal pulse generated by it is relatively large, which is similar to the amplitude of the electrical signal pulse generated by the neutron incident on the 6-LiI crystal. It cannot be eliminated by amplitude discrimination, which reduces the accuracy of detection results.

[0027] The neutron detector in the embodiment of the present invention includes two photoelectric converters, namely a first photoelectric converter and a second photoelectric converter, and also includes a first amplification circuit and a first pulse discrimination circuit corresponding to the two respectively As well as the second amplification circuit and the second pulse discrimination circuit, the amplified and amplitude-discriminated first electrical signal and the second electrical signal are input to the time coincidence circuit for judgment, and if the time w...

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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...

Claims

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Application Information

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IPC IPC(8): G01T3/06
Inventor 江滨清谢广利沈卫科陈波
Owner RAE SYST SHANGHAI
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