Nasal swab detection device for alpha radioactive internal contamination

A technology of alpha radioactivity and detection device, applied in the field of alpha radioactive contamination detection system, can solve the problems of being unsuitable for mass population screening and measurement, weak penetrating ability, etc., and achieve the effect of reducing the detection lower limit and increasing the detection efficiency

Active Publication Date: 2016-05-04
CHENGDU UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the range of α-rays is only a few centimeters in the air, and the penetrating ability is very weak, when a nuclear accident or leak occurs, it mainly migrates with aerosols; secondly, because it

Method used

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  • Nasal swab detection device for alpha radioactive internal contamination
  • Nasal swab detection device for alpha radioactive internal contamination
  • Nasal swab detection device for alpha radioactive internal contamination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: see Figure 1 to Figure 4 , a nasal swab detection device for α-radioactive internal contamination, comprising a nasal swab holder 1 for installing a nasal swab, a sample holder 2 for installing a nasal swab holder 1, and a vacuum chamber 3, and the nasal swab is composed of a rod 12 and the head 11, the head 11 is wrapped with a filter membrane;

[0032] The nasal swab holder 1 can be equipped with at least one nasal swab without covering the head 11 of the nasal swab;

[0033] The sample rack 2 is a rectangular parallelepiped that is placed horizontally and is hollow inside, including left side, right side, front end, and rear end. Windows are provided on the four sides, and a pop-up mechanism 21 is provided at the rear end of the sample rack 2. , the nasal swab holder 1 can be inserted from the front end of the sample holder 2, and closely cooperates with the pop-up mechanism 21;

[0034] A detector 22 is symmetrically arranged on the left and right s...

Embodiment 2

[0038] In order to facilitate the actual simulation, we give the specific dimensions of the product, vacuum chamber 3: length × width × height: 234mm × 132mm × 102mm; nose swab holder 1: length × width × height: 102mm × 56mm × 6mm.

[0039] Since there is no standard α radioactive internal pollution nasal swab detector on the market, only a general α radioactive measuring instrument is used for α radioactive measurement after chemical treatment and electroplating. The detector 22 of the general α radioactive measuring instrument The samples are all placed horizontally, and the mutual structural relationship between them is a structure in which the surfaces are parallel and the positions are in an up-and-down relationship. There is only one detector 22, that is, the general-purpose α radiation measuring instrument can only measure one surface of the sample to be tested, that is, It is a measurement close to 2π that is often said in our prior art.

[0040]The present invention i...

Embodiment 3

[0042] On the basis of Embodiment 2, the electric field is increased, that is, an electric field generator interface is provided on the locking mechanism 24, the positive pole of the electric field generator is connected with the end face of the ejection mechanism 21 and the nose swab holder 1, and the negative pole is connected with the sample holder. 2. The detectors 22 on the left and right sides are connected to each other. Metal rings are provided on the front and back of the nasal swab holder 1, and when the nasal swab holder 1 is closely matched with the pop-up mechanism 21, the metal ring communicates with the positive pole of the electric field generator , the metal ring is located on the inner edge of the through hole 13 .

[0043] That is to say, when the nasal swab is inserted into the nasal swab holder 1, the positive electrode is located on the nasal swab holder 1, and the negative electrode is located on the inner wall of the vacuum chamber 3 and faces the left a...

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PUM

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Abstract

The invention discloses a nasal swab detection device for alpha radioactive internal contamination. The device comprises a nasal swab frame, a sample frame and a vacuum cavity, wherein wherein the nasal swab frame is used for mounting nasal swabs, the sample frame is used for mounting the nasal swab frame, at least one nasal swab can be mounted on the nasal swab frame, and the heads of the nasal swabs cannot be shielded; an ejection mechanism is mounted on the rear end surface in the sample frame, and the nasal swab frame can be inserted from the front end surface of the sample frame and is tightly matched with the ejection mechanism; detectors are symmetrically arranged on the left side and the right side of the sample frame and connected with one preset signal processing circuit respectively, and the sample frame is located in the vacuum cavity. According to the nasal swab detection device for alpha radioactive internal contamination, a nasal cavity wiping object of a to-be-tested person is taken as a target detection object, the nasal swabs are inserted into the sample frame, detection circuits are arranged on two sides of the sample frame, the whole is placed into the vacuum cavity to be vacuumized for measuring, the distances of a to-be-tested sample and the detectors are fixed, the double detectors form double surface stereo-measurement, and vacuumizing is combined, so that the detection efficiency is improved greatly, and the minimum detectable limit is reduced.

Description

technical field [0001] The invention relates to an α-radioactive contamination detection system, in particular to a nasal swab detection device for α-radioactive internal contamination. Background technique [0002] Usually radioactive substances with heavy atomic numbers, such as uranium series and thorium series, emit alpha particles through alpha decay. Alpha rays are a stream of charged particles, which easily cause ionization wherever they go due to the charge. Alpha rays have a strong ionization ability, so they are destructive, especially to the tissues in the human body. In addition, its mass is relatively large, its penetrating ability is poor, and its range in the air is only a few centimeters, which can be blocked by a piece of paper or healthy skin. Therefore, the protection against alpha radiation is mainly to prevent it from entering the body through the respiratory system or oral cavity. Natural α-rays mainly come from cosmic rays and some natural radioactiv...

Claims

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Application Information

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IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 成毅庹先国姚付良李三刚赵柏俊余运强
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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