Access control detection system and detection method using energy spectrum recognition algorithm

A detection system and recognition algorithm technology, applied in the X-ray energy spectrum distribution measurement, measurement device, radiation measurement, etc., can solve the problems of serious optical signal attenuation, light collection efficiency reduction, detection efficiency reduction, etc., to improve detection sensitivity , avoid the effect of low detection efficiency and high detection efficiency

Pending Publication Date: 2020-04-24
TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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  • Abstract
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Problems solved by technology

[0014] The purpose of the present invention is to solve the problem that when the plastic scintillator is long, the optical path of the photons generated by the incident ions far away from the light collection point reaches the collection point is long, the attenuation of the optical signal is serious, the light collection efficiency is reduced, and the detection efficiency is reduced. To reduce the problem, provide an access control detection system that uses a large-area plastic scintillator as the detection medium, forms a detector with a dual-channel photomultiplier tube, and collects signals by combining multiple pulses and coincidence counts to detect iodine-125 particles. And the detection method using the energy spectrum recognition algorithm

Method used

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  • Access control detection system and detection method using energy spectrum recognition algorithm
  • Access control detection system and detection method using energy spectrum recognition algorithm
  • Access control detection system and detection method using energy spectrum recognition algorithm

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Embodiment 1

[0052] An access control detection system, comprising: a plastic scintillator, the two ends of the plastic scintillator are respectively connected with a photomultiplier tube, and the two ends of the plastic scintillator are respectively electrically connected to a signal acquisition system for signal acquisition , the single-channel analyzer of the two-way signal acquisition system is connected through a coincidence counter to measure the two-way coincidence count, and the single-channel analyzer output of the signal acquisition system is connected through a summing counter for the two-way signal add up.

[0053] Nr=N 1 +N 2 -Ncoin

[0054] Compare Nr with Ns, if the two results are in good agreement, it shows that the method of using the adder to collect the two signals is feasible.

[0055] Use the energy spectrum recognition algorithm to detect the radionuclide radioactivity of the iodine-125 particle source for medical radiopharmaceuticals, and use ...

Embodiment 2

[0057] According to the access control detection system described in Embodiment 1, the signal acquisition system includes a voltage divider circuit, an amplifier, a single-channel analyzer and a scaler connected in sequence.

Embodiment 3

[0059] A detection method utilizing an energy spectrum recognition algorithm for an access control detection system, the method comprising the steps of:

[0060] (1) Lower threshold design and width selection of magnification and energy window;

[0061] Using the form of recursion, first set the monitoring alarm threshold and magnification, measure the Compton curve of the active count and the background, draw the change curve of these quantities with the lower threshold of the single channel, and select the appropriate magnification and the lower threshold and width of the energy window;

[0062] (2) Use the moving average detection method to measure the threshold;

[0063] (3) Use the energy spectrum recognition algorithm to compare and analyze the energy spectrum of the detection object and the background energy spectrum to make an alarm judgment, and judge whether the detection object contains radionuclides according to the change of the detection energy spectrum shape. ...

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Abstract

The invention discloses an access control detection system and a detection method using an energy spectrum recognition algorithm. According to the detection method, when a plastic scintillator is long, an optical path of photons generated by incident ions far away from a light collection point to the collection point is long, the attenuation of light signals is severe, the light collection efficiency is reduced, and the detection efficiency is reduced. The access control detection system is composed of a plastic scintillator, wherein two ends of the plastic scintillator are connected with photomultipliers respectively; the two ends of the plastic scintillator are electrically connected with a signal acquisition system for signal acquisition; two paths of single-channel analyzers of the signal acquisition system are connected by means of a coincidence counter and are used for measuring two paths of coincidence counts; and output ends of the single-channel analyzers of the signal acquisition system are connected by means of a summing counter and used for summing the two paths of signals. The detection method is used for detecting iodine-125 particles in access control.

Description

Technical field: [0001] The invention relates to an access control detection system and a detection method using an energy spectrum recognition algorithm. Background technique: [0002] In recent years, with the rapid development of nuclear energy and nuclear technology, radioactive isotopes have been widely used in many fields such as industry, agriculture, medical treatment, and scientific research, but the possible radioactive pollution has also become a common concern and concern of the public. focus problem. With the rapid development of nuclear medicine and the increasing application of medical radionuclides, the application of iodine-125 particle source implantation is increasing exponentially every year [1] . At present, in the process of using iodine-125 particle sources in some hospitals, they only pay attention to the activity and therapeutic effect of the implanted patients, and lack of dose supervision for patients after implantation [2] . However, iodine-12...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/203G01T1/36
CPCG01T1/203G01T1/2006G01T1/362
Inventor 闫海霞赵孝文李岩姚钢范庆丽蒋继成庞杨
Owner TECHN PHYSICS INST HEILONGJIANG ACADOF SCI
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