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Large-sized artificial nuclide plane source calibration device and gamma ray spectrometer calibration method thereof

A calibration device and gamma energy spectrometer technology, which is applied in X-ray energy spectrum distribution measurement, radiation intensity measurement, etc., can solve problems such as not being able to meet the requirements of prior calibration, to ensure no damage, ensure uniformity, and ensure activity distribution effect

Active Publication Date: 2010-03-10
核工业航测遥感中心
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cannot meet the pre-calibration requirements of daily monitoring and emergency monitoring

Method used

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  • Large-sized artificial nuclide plane source calibration device and gamma ray spectrometer calibration method thereof
  • Large-sized artificial nuclide plane source calibration device and gamma ray spectrometer calibration method thereof
  • Large-sized artificial nuclide plane source calibration device and gamma ray spectrometer calibration method thereof

Examples

Experimental program
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Embodiment Construction

[0037] like figure 1 and figure 2 As shown, a large-scale artificial nuclide plane source calibration device includes a movable flat trolley and a plane source laid on the trolley. It is characterized in that: the plane source consists of 8 isosceles trapezoidal facet sources with a base angle of 60° Spliced ​​together, each isosceles trapezoidal facet source includes a structural support plate with barrier strips on the edge, filter paper dripped with source liquid is glued on the support plate, and the upper layer of the filter paper is encapsulated with viscous resin.

[0038] The specific manufacturing process of the planar source is as follows:

[0039] like image 3 As shown, the rigid aluminum alloy pallet can be processed into an isosceles trapezoidal pallet with a bottom angle of 60°, an upper bottom of 500mm, a lower bottom of 1000mm, and a height of 433mm. The bottom thickness of the pallet can be 8mm, and the edge can be provided with Barrier strips with a widt...

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Abstract

The invention provides a large-sized artificial nuclide plane source calibration device and an optimized calibration method for calibrating a machine-mounted / vehicle-mounted gamma ray spectrometer byusing the device. In the device, the design that eight isosceles trapezoids are combined to form a regular hexagon plane source realizes the conversion of a limited plane source into an unlimited (saturated) plane source through gapless joint; a rigid supporting plate structure ensures the planarity of the plane source; the uniform mesh distribution on filter paper and the use of quantitative liquid filler for filling raw liquid ensure the design activity of the plane source and the uniformity of activity distribution; the sealing of the plane source by adhesive resin ensures that source spotsare free from damages and the long-term stability of the activity of the plane source; and the establishment of an angle response model provides a feasible technical evidence for the reduction of detection workload in a follow-up detection process, and the calibration method can be used to calculate a calibration factor when no obvious change occurs in the angle response model.

Description

technical field [0001] The invention relates to the field of nuclear and radiation environment monitoring and measurement, in particular to an artificial nuclide plane source calibration device. Background technique [0002] The calibration method of large-scale gamma spectrometers such as airborne / vehicle-based monitoring of artificial radionuclides, because no natural calibration field can be found in nature, in the past, point source calibration and / or "post-site comparison" calibration methods were often used. For example, after the accident at the Chernobyl nuclear power plant in the former Soviet Union in 1986, when Sweden applied the airborne method (aerial survey) for emergency monitoring in the local area, it adopted the calibration method of on-site comparison to carry out the airborne gamma spectrometer calibration. [0003] Point source calibration of large gamma spectrometers is only suitable for objects that can hover in the air on which the spectrometer is mo...

Claims

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Application Information

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IPC IPC(8): G01T1/16G01T1/36
Inventor 张积运江民忠胡明考陈细林周宗杰管少斌肖雪夫王新兴王军刘峰张家秋李峰林张长兴高惠
Owner 核工业航测遥感中心
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