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Neutron detection method and device for reducing gamma ray interference by using silicon PIN detector

A detection method and technology of detection equipment, applied in the field of radiation measurement, can solve problems such as interference with neutron dose measurement results, and achieve the effects of increasing response, improving detection effect, and accurate detection effect

Pending Publication Date: 2019-01-04
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

At this time, the response caused by γ-rays will seriously interfere with the measurement results of neutron dose, so the commonly used pulse amplitude screening technology will produce large deviations in the case of high-energy γ-rays in the mixed radiation field

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  • Neutron detection method and device for reducing gamma ray interference by using silicon PIN detector
  • Neutron detection method and device for reducing gamma ray interference by using silicon PIN detector

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0050] Silicon PIN detectors are used for the detection of γ-rays and X-rays. They have the characteristics of high sensitivity to γ-rays (can detect γ-rays in the energy range from 662keV to 3MeV), and are insensitive to neutron rays. Silicon PIN detection The response of the detector to neutron radiation and 6 The response of LiI scintillator to neutron rays can be ignored, and the energy response of silicon PIN detector after energy compensation is good (the energy response of silicon PIN detector is not linear, in order to obtain better energy response, silicon PIN detectors need to perform corresponding energy compensation), so in 6 Place a silicon PIN detector near the LiI scintillator, use 6 A more accurate net neutron count rate can be obtained by subtracting the count rate measured by the silicon PIN detector from the count rate measured by t...

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Abstract

The invention belongs to the radiation measurement technical field and relates to a neutron detection method and device for reducing gamma ray interference by using a silicon PIN detector. According to the neutron detection method and device of the invention, a 6LiI scintillator detector is adopted to detect neutron rays in a mixed radiation field; a first voltage amplitude discrimination threshold is set in a first comparison circuit connected with a 6LiI scintillator; and the signals of low-energy gamma rays measured by the 6LiI scintillator are filtered out. In order to eliminate the influence of high-energy gamma rays on a measurement effect, the neutron detection method of the present invention includes the following steps that: (S1) a silicon PIN detector is arranged near a 6LiI scintillator; (S2) a second voltage amplitude discrimination threshold is set in a comparison circuit connected with the silicon PIN detector; (S3) first signals measured by the 6LiI scintillator are recorded, and second signals measured by the silicon PIN detector are recorded; and (S4) the second signals are multiplied by a correction factor, and the second signals multiplied by the correction factor are subtracted from the first signals, so that a net neutron count rate is obtained.

Description

technical field [0001] The invention belongs to the technical field of radiation measurement, and in particular relates to a neutron detection method and equipment for reducing gamma ray interference by using a silicon PIN detector. Background technique [0002] As we all know, the space particle radiation environment includes not only charged particles such as protons and electrons, but also non-charged particles such as neutrons (n) and X-rays. As an important uncharged particle, neutron has been widely concerned by people, and the detection technology related to neutron has always been a research hotspot. Since neutrons are often accompanied by a large number of γ-rays, removing the interference of γ-rays on neutron signals is a research hotspot and difficulty in the field of neutron detection. The discrimination between neutrons and gamma rays is the basis of neutron detection technologies such as contraband detection, environmental radiation detection, military and dee...

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Application Information

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IPC IPC(8): G01T3/06
CPCG01T3/06
Inventor 李建伟李德源杨明明杨彪林海鹏于伟跃张凯王勇赵佳辉李健杨发涛张文涛张秀杨甲桥吕文强赵迎喜宋嘉涛刘建忠
Owner CHINA INST FOR RADIATION PROTECTION
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