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Reverse Compton scattering and background ray lung pollution detection device and method

An anti-Compton, detector technology, applied in radiation measurement, X/γ/cosmic radiation measurement, instruments, etc., can solve the problems of increasing the weight of the detection system, it is difficult to reduce the Compton scattering, etc., to improve the energy Resolution, effect of reducing minimum detectable activity, increasing sensitivity

Inactive Publication Date: 2016-09-28
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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Problems solved by technology

At present, the lead shielding and other measures taken in the measurement of the pollution in the lungs have a certain environmental background shielding effect, but at the same time increase the weight of the detection system, and it is difficult to reduce the background formed by Compton scattering.

Method used

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  • Reverse Compton scattering and background ray lung pollution detection device and method
  • Reverse Compton scattering and background ray lung pollution detection device and method
  • Reverse Compton scattering and background ray lung pollution detection device and method

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Embodiment 1

[0032] Embodiment 1: see Figure 1 to Figure 3 , set up as figure 1 A structure of anti-Compton scattering and background radiation intrapulmonary contamination detectors is shown, the structure includes detectors including a central detector 1 and several vetoing detectors 2 located in the same plane , wherein the rejection detector 2 circles around the periphery of the central detector 1 and is fixedly connected to the side of the central detector 1, and the adjacent rejection detectors 2 are closely attached;

[0033] The output terminal of described central detector 1 is connected with an ADC with its nuclear pulse signal analog-to-digital conversion;

[0034] Described rejection detector 2 output ends are connected one by one and will reject the shaping circuit that the nuclear pulse signal of detector 2 is converted into square wave signal;

[0035] The output ends of the ADC and the shaping circuit are also connected to a Compton scattering and background event discri...

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Abstract

The invention discloses a lung pollution detector and detection method for anti-Compton scattering and background rays, including a detector, an ADC, a shaping circuit, a Compton scattering and background event discrimination circuit, a DAC, and a filter circuit , the detectors include a central detector and several veto detectors located on the same plane. Whether the detected signal is Compton scattering and background events. The invention utilizes the central detector and the peripheral veto detector to carry out measurement at the same time, and distinguishes Compton scattering and environmental background rays through logical judgment, thereby significantly reducing the background in the measurement energy spectrum and improving the energy resolution and peak value of the detector. Combi, which helps to reduce the minimum detectable activity of contamination in the lungs and improves the sensitivity of the measurement. The detector has the advantages of small size and light weight, which is convenient for on-site measurement.

Description

technical field [0001] The invention relates to a nuclear pollution detector and a detection method, in particular to an anti-Compton scattering and background ray pollution detector and a detection method in the lungs. Background technique [0002] In nuclear workplaces and nuclear accident areas, some radionuclides, such as I-131, Cs-137, etc., will be deposited in the lungs once inhaled by the human body. Nowadays, for the detection of pollution deposits in the lungs, counters are usually aimed at the human lungs to measure the gamma rays released by the deposited nuclides in the lungs to estimate the amount of nuclides deposited in the lungs. Compton scattering and natural background are the influences. The main factor for the lower limit of detection. At present, the measures such as lead shielding adopted in the measurement of internal lung pollution, although they have a certain environmental background shielding effect, at the same time increase the weight of the de...

Claims

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Application Information

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IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 王磊庹先国刘明哲杨国山潘洁杨剑波成毅李三刚黄博川余运强赵柏俊卢位
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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