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Beta surface polluted-position resolution measurement method

A technology of surface pollution and measurement method, which is applied in measurement devices, radiation measurement, X/γ/cosmic radiation measurement, etc., can solve the problem of not being able to provide sensitive detection area surface pollution distribution, that is, position resolution information, etc. The effect of light collection efficiency, high light collection efficiency, and high detection sensitivity

Active Publication Date: 2014-04-02
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

The surface pollution instrument used in this measurement method has a large sensitive detection area, but it cannot give the distribution of surface pollution within the sensitive detection area, that is, position resolution information. Therefore, it is urgent to study a position resolution measurement method suitable for large-area β surface contamination.

Method used

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  • Beta surface polluted-position resolution measurement method
  • Beta surface polluted-position resolution measurement method
  • Beta surface polluted-position resolution measurement method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The position-resolved measurement method of β surface pollution, the schematic diagram of the method is as follows figure 1 As shown, the method uses a position-resolving detector of β surface contamination to measure a β radioactive surface contamination source, which includes the following steps:

[0043] (1) Acquisition of positional relationship standard curve

[0044] Sequentially select each of several regional units with the same area and shape divided by the wavelength conversion optical fiber on the plastic scintillator of the β surface pollution position-resolving detector; move the β on the surface of the plastic scintillator in the area unit When the β radiation source is in different positions of the area unit, the signal amplitude of the two transverse wavelength conversion fibers and the signal amplitudes of the two longitudinal wavelength conversion fibers surrounding the area unit are measured simultaneously; according to the two transverse wavelength c...

Embodiment 2

[0054] The method and detector used in Example 1 are the same, the difference is that each of several regional units with the same area and shape divided by the wavelength conversion optical fiber on the plastic scintillator of the β surface contamination position-resolving detector can also be sequentially selected Area unit; move a beta radiation source with known activity on the surface of the plastic scintillator in the area unit, and measure the four wavelength conversion optical fibers surrounding the area unit when the beta radiation source is in different positions of the area unit The coincidence count rate; according to the coincidence count rate of the four optical fibers, and the relative distance between the β radiation source and the four wavelength fibers, the detection efficiency curve is drawn. Therefore, on the basis of determining the position of the β surface contamination, the detector calculates the total activity of the β surface contamination by weightin...

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Abstract

The invention belongs to the technical field of radioactive pollution monitoring, and discloses a beta surface polluted-position resolution measurement method. The method is used for detecting the beta radioactive surface pollution by utilizing a beta surface polluted-position resolution detector, and comprises the following steps of acquiring a position relation standard curve and measuring the beta radioactive surface pollution. The method has the advantages of simplicity, low detection lower limit, large detection sensitive area, high measuring speed and capability of accurately measuring polluted-position information.

Description

technical field [0001] The invention belongs to the technical field of radioactive pollution monitoring, and in particular relates to a position resolution measurement method for beta surface pollution. Background technique [0002] β radioactive surface contamination monitoring is an important part of radiation protection monitoring. For the rapid measurement of β-ray surface pollution in the event of an accident, the β surface pollution detector is required to have a large sensitive area, easy to carry, low environmental requirements, and high measurement accuracy to determine the scope of the pollution site, pollution hotspots and pollution levels. [0003] The measurement method of β surface contamination widely used at this stage is to use gas detectors, scintillator detectors, semiconductor detector arrays or GM tubes to measure β rays. Compared with other β-surface pollution detectors, plastic scintillator detectors have low environmental requirements, are portable, ...

Claims

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Application Information

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IPC IPC(8): G01T1/169
Inventor 曲延涛刘阳王仲文陈凌王惠
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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