CN-121978735-A - Radioactive substance monitoring module and monitoring method

CN121978735ACN 121978735 ACN121978735 ACN 121978735ACN-121978735-A

Abstract

The application discloses a radioactive substance monitoring module and a monitoring method, which belong to the technical field of radiation monitoring, wherein the monitoring module comprises a sampling cover, a casing, a sampling assembly, a charged particle detector and a signal processor, wherein the sampling assembly, the charged particle detector and the signal processor are arranged in the casing, the sampling assembly is used for collecting radioactive particles, the charged particle detector is used for sensing charged particles emitted by the radioactive particles, and the signal processor is electrically connected with the charged particle detector and is used for receiving signals output by the charged particle detector. The monitoring method comprises the steps of starting a transmission mechanism, starting an air suction fan, enabling air to enter a shell through a sampling cover and be trapped by a filter material, and acquiring radioactivity spectrum analysis data output by a signal processing assembly. The application innovatively adopts the vertical stacking design of the signal processing component, the charged particle detector and the air suction fan, greatly reduces the axial dimension of the product, omits internal gas path connection, meets the light-weight and miniaturized design requirement, and is suitable for carrying a small unmanned aerial vehicle for monitoring radioactive substances.

Inventors

HE YUEHONG
WANG XIAOLIN
TAN ZHAOYI
WANG ZHONGTANG
HUANG XI
ZHANG ZHEN
WEN WEI
Zhou yinxing

Assignees

中国工程物理研究院核物理与化学研究所

Dates

Publication Date: 20260505
Application Date: 20251020

Claims (10)

1. The radioactive substance monitoring module is characterized by comprising a sampling cover (110) and a shell (120), wherein the sampling cover (110) is used for guiding air into the shell (120), and the radioactive substance monitoring module further comprises a sensor arranged in the shell (120): A sampling assembly (130) for collecting radioactive particles in an aerosol carried in air; a charged particle detector (140) for sensing charged particles emitted by radioactive particles collected on the sampling assembly (130); and the signal processing component (150) is electrically connected with the charged particle detector (140) and is used for receiving signals output by the charged particle detector (140).
2. The radioactive material monitoring module according to claim 1, wherein the sampling assembly (130) comprises: An air suction fan (131) for sucking and collecting aerosol; a porous plate (132) provided at a gas inlet of the suction fan (131); a filter material (133) for filtering radioactive particles in air, wherein the filter material (133) is flatly paved on the surface of the porous plate (132) facing the charged particle detector (140); and a transmission mechanism (134) equipped with the filter medium (133) for transmitting the filter medium (133).
3. The radioactive substance monitoring module according to claim 2, wherein the sampling assembly (130) further comprises a differential pressure sensor (135) mounted beside the filter material (133), the differential pressure sensor (135) is used for detecting the differential pressure of the air on both surfaces of the filter material (133), and feeding back a signal to the control system of the air suction fan (131) to adjust the magnitude of the calculated sampling flow.
4. A radioactive material monitoring module according to claim 2 or 3, further comprising an angle-restricting shutter (136) provided between the charged particle detector (140) and the sampling assembly (130), the angle-restricting shutter (136) being provided with a plurality of shutters to block part of charged particles emitted from radioactive particles on the sampling assembly (130).
5. The radioactive material monitoring module of claim 4, wherein a plurality of the barrier tabs are connected in a cross-like manner and the position of the connection corresponds to the porous plate (132) with an included angle between adjacent barrier tabs.
6. A radioactive material monitoring module according to claim 2 or 3, characterized in that a distance between a surface of the charged particle detector (140) and a surface of the filter (133) is 4mm or more.
7. The radioactive material monitoring module according to claim 2, wherein the signal processing assembly (150) comprises an amplifier and a multichannel pulse amplitude analyzer electrically connected, the multichannel pulse amplitude analyzer being configured to output radioactivity spectrum analysis data, and to reduce the interference level of radon daughter based on the spectrum analysis data.
8. The radioactive material monitoring module according to claim 2, wherein a plurality of air flow openings are provided in a side surface of the sampling hood (110), and a plurality of the air flow openings are arranged around the sampling hood (110) in a circle.
9. The radioactive material monitoring module according to claim 8, wherein a rigid connection is provided between the sampling hood (110), the signal processing assembly (150), the charged particle detector (140), and the sampling assembly (130).
10. A monitoring method of a radioactive substance monitoring module is characterized in that, use of a radioactive material monitoring module according to any one of claims 2 to 9, comprising: Activating the transmission mechanism (134) to enable the filter material (133) to be transmitted to the porous plate (132); Starting the air suction fan (131), enabling air to enter the shell (120) through the sampling cover (110), and enabling aerosol particles carried in the air to be trapped in the filter material; And after sampling and measuring for a period of time, acquiring the analysis data of the radioactivity energy spectrum output by the signal processing component (150), and calculating the concentration of the nuclide aerosol to be detected in the air.

Description

Radioactive substance monitoring module and monitoring method Technical Field The application belongs to the technical field of radiation monitoring, and particularly relates to a radioactive substance monitoring module and a radioactive substance monitoring method. Background After nuclear accidents happen, a large amount of radioactive substances can be released to the environment, and the concentration of the aerosol of the radioactive substances is monitored on the accident site, so that the method has important significance for studying and judging the development trend of the accidents, evaluating the radiation results and judging the affected area range. Because the accident scene environment has unpredictability, the traditional product has large volume and weight, and the problem of inconvenient maneuvering deployment exists, and even the traditional product cannot be deployed and used in certain scenes. With the wide application of unmanned aerial vehicles in the accident investigation field, a lightweight monitoring device and method are urgently needed, and the lightweight monitoring device and method can be deployed on a small unmanned aerial vehicle for timely investigation of an accident scene to acquire radioactive aerosol pollution information. Disclosure of Invention The application aims to solve the technical problem of lack of light-weight radioactive monitoring equipment at present, and therefore, the application provides a radioactive substance monitoring module and a monitoring method, the application innovatively adopts the vertical stacking design of the signal processing component, the charged particle detector and the air suction fan, so that the axial dimension of the product is greatly reduced, the internal gas path connection is omitted, the light-weight and miniaturized design requirement is realized, and the application is suitable for carrying a small unmanned aerial vehicle for monitoring radioactive substances. In a first aspect, an embodiment of the present application provides a radioactive material monitoring module, including a sampling hood and a housing, the sampling hood being configured to direct air into the housing, and further including a housing disposed within the housing: The sampling assembly is used for collecting radioactive particles in aerosol carried in the air; The charged particle detector is used for sensing charged particles emitted by radioactive particles collected on the sampling assembly; and the signal processing assembly is electrically connected with the charged particle detector and is used for receiving signals output by the charged particle detector. In some embodiments, the sampling assembly comprises: the air suction fan is used for sucking and collecting aerosol; The porous plate is arranged at the gas inlet of the air suction fan; the filter material is used for filtering radioactive particles in the air, and is paved on the surface of the perforated plate, the front surface of which faces the charged particle detector; And the transmission mechanism is provided with a filter material and is used for conveying the filter material. In some embodiments, the sampling assembly further comprises a differential pressure sensor, which is installed beside the filter material, and the differential pressure sensor is used for detecting the differential pressure of the air on two surfaces of the filter material and feeding back a signal to the control system of the air suction fan so as to adjust and calculate the sampling flow. In some embodiments, the apparatus further comprises an angle-restricting shutter disposed between the charged particle detector and the sampling assembly, the angle-restricting shutter being provided with a plurality of shutters to block charged particles of a specific angle emitted from the radioactive particles on the sampling assembly. In some embodiments, the plurality of baffles are connected in a cross shape, and the positions of the joints correspond to the porous plate, and an included angle is formed between the adjacent baffles. In some embodiments, the spacing between the surface of the charged particle detector and the surface of the filter is 4mm or more. In some embodiments, the signal processing assembly includes an electrically connected amplifier and a multi-channel pulse amplitude analysis instrument for outputting radioactivity spectrum analysis data to reduce the level of radon daughter interference based on the spectrum analysis data. In some embodiments, the display control assembly is mounted on the casing and electrically connected with the multichannel pulse amplitude analysis instrument for display and control. In some embodiments, the sides of the sampling cap are provided with a plurality of airflow openings arranged circumferentially around the sampling cap. In some embodiments, the sampling hood, the signal processing assembly, the charged particle detector, and the sampling assembly are rig