Solid radium source field calibrating device and method

A technology of on-site calibration and radium source, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., to achieve the effect of eliminating influencing factors, benefiting and improving measurement accuracy

Inactive Publication Date: 2015-07-29
核工业航测遥感中心
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  • Abstract
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At present, there are no related reports on the realization of on-site calibration of solid radium sources

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  • Solid radium source field calibrating device and method
  • Solid radium source field calibrating device and method
  • Solid radium source field calibrating device and method

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Embodiment Construction

[0049]A solid radium source on-site calibration device and its calibration method of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments:

[0050] Such as figure 1 As shown, an on-site calibration device for a solid radium source includes a well-type ionization chamber 1 , an electrometer 2 , a low-energy γ-ray shielding device 3 and a source-measurement bracket 4 . Among them, the well-type ionization chamber 1 is a sealed axisymmetric shape, generally well-shaped, and belongs to the measurement of the 4π space solid angle, which eliminates the influence of different geometric shapes such as the center position of different types of radium sources and the diameter of the source shell; The well-type ionization chamber 1 is filled with argon gas to improve the sensitivity of the ionization chamber and reduce the statistical fluctuation of radioactivity during measurement. The pressure of argon gas in the well-type...

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Abstract

The invention belongs to the technical field of nuclear and radiation environment monitor and measurement and particularly relates to a solid radium source field calibrating device and method. The device comprises a well-type ionization chamber (1), an electrometer (2), a low-energy gamma ray shielding device (3) and a source measurement rack (4). The method comprises the steps of determining of the optimal working area of the well-type ionization chamber, monitored measurement of a monitored source, field testing preparation, radium content calculation and the like. The application of the solid radium source field calibrating device to radioactive source calibration of uranium exploration changes the tracing manner of inspection of traditional radioactive sources and eliminates potential risks of movement and transportation of radioactive source tracing. The solid radium source field calibrating method achieves field calibration of solid radium sources.

Description

technical field [0001] The invention belongs to the technical field of nuclear and radiation environment monitoring and measurement, and in particular relates to an on-site calibration device for a solid radium source and a calibration method thereof. Background technique [0002] The solid radium source is the standard radioactive source for the calibration and stability monitoring of measuring instruments used in uranium ore exploration. In the world and in my country, flat-panel ionization chambers have been used to test the radium content for calibration. The calibration device consists of a flat-plate ionization chamber, a dosimeter and a set of standard radium sources. Calibration is performed by alternately measuring the ionization current on the ionization chamber between the calibrated radium source and the standard radium source. The relative uncertainty of the calibration results is generally 8 %. [0003] When a flat ionization chamber is used to calibrate the s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/29
Inventor 周宗杰张积运胡明考管少斌张长兴王新兴李峰林梁永顺唐晓川刘峰杜晓立欧阳游刘珊珊
Owner 核工业航测遥感中心
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