A kind of tomographic gamma scanning measurement method

A measurement method and axial layering technology, applied in the field of radiation detection, can solve the problems of measurement and analysis methods such as long measurement time, misoperation is not easy to be found, and no report is made, so as to achieve short measurement time, improved data statistics, Effect of reducing measurement time

Active Publication Date: 2016-01-27
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

There are many relevant documents disclosed about the tomographic gamma scanning measurement method, but judging from the existing published documents, the basic principles of the method are basically briefly described in the documents, and the specific operation steps or methods No report has been made, and the time of each measurement in the existing measurement method is the same, the measurement time of the measurement analysis method is long, the analysis accuracy is low, and the misoperation is not easy to be found, which often leads to the failure of the implementation

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  • A kind of tomographic gamma scanning measurement method
  • A kind of tomographic gamma scanning measurement method
  • A kind of tomographic gamma scanning measurement method

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Embodiment 1

[0058] Experimental measurement of uranium-containing samples figure 1 It is carried out on the TGS device shown. The measuring sample barrel is a stainless steel barrel with a height of 30 cm, an inner diameter of 30 cm, and a wall thickness of 0.5 cm. A bottle of known quality is placed in the barrel. 235 U uranyl nitrate highly enriched uranium solution (the solution is sealed in a polyethylene container with a diameter of 9.6 cm, a height of 14 cm, and a wall thickness of 0.3 cm). Place iron blocks, aluminum blocks, plastic blocks, iron filings and rags as media in other spaces in the barrel. The transmission source 2 used for transmission measurement is 75 Se.

[0059] When scanning and measuring, a 6×6×6 sample voxel is used to form a model, that is, the sample barrel is divided into 6 layers in the axial direction, each layer is divided into 36 (6×6) blocks, and each voxel is a cube with a side length of 5 cm. First, through the sample positioning system, the sample is lay...

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Abstract

The invention discloses a tomographic gamma scanning and measuring method which comprises the following steps of: 1, performing transmitting measurement on a sample, namely (1) positioning and axially layering the sample; (2) selecting translation position points in equal interval on each layer; (3) rotating the sample around the central axis of a platform at each horizontal translation position point, and selecting eight rotating angles between 0 and 180 degrees in equal angle, wherein once measurement is performed while rotating once, and eight-time measurement is performed at each horizontal position point; 2, performing emission measurement on the sample; and 3, correcting the absorption attenuation of emitted gamma rays which penetrate through the measured sample by utilizing a dielectric wire attenuation coefficient obtained through transmitting gamma scanning measurement, and obtaining the radioactive content. The invention provides the tomographic gamma scanning and measuring method which is short in measurement time, high in analytical precision and high in measurement accuracy.

Description

Technical field [0001] The present invention relates to the field of radiation detection technology, in particular to a tomographic gamma scanning measurement method for non-uniform radioactive materials. Background technique [0002] Before the disposal and treatment of radioactive waste and waste, it is necessary to quantitatively detect the radioactive content. For the detection of non-uniform radioactive waste and waste, it is impossible to obtain representative samples for quantitative measurement and analysis by chemical analysis methods. The effective method is non-destructive testing technology. The measurement equipment used is tomographic gamma scanning measurement device. The measurement analysis technology firstly separates the measured sample into axial layers, and in each layer, the sample is divided into several parts by horizontal movement and rotation. A small cube (voxel) measures and analyzes each voxel to obtain the radionuclide content in each voxel. Add the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/02G01N23/22
Inventor 隋洪志周志波甘霖何丽霞张其欣
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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