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Radiographic testing method with simultaneous use of two different gamma sources

A technology of radiography and detection method, which is applied in the direction of using radiation for material analysis, etc., can solve the problems of low resolution of scanned images and cannot be stored for a long time, and achieves the effect of high detection sensitivity, guaranteed installation quality and high resolution

Active Publication Date: 2014-03-12
ANHUI SANXING TESTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This application is a radiographic device used to scan passengers' luggage at airports and stations, and observe the scanned image on a fluorescent screen to determine whether there are prohibited items inside. The shortcoming of this application is the resolution of the scanned image low, and cannot be stored for a long time

Method used

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  • Radiographic testing method with simultaneous use of two different gamma sources

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Embodiment 1

[0034] In this embodiment, both 192 Irγ source and Seγ source, take the central transillumination method to a 200m 3 The butt welded joint of the spherical storage tank is subjected to radiographic inspection. The material of the spherical tank is 16MnR, and the specification is φ7100×22mm. in use 192 The radioactivity of the Irγ source is 85Ci, 75 The radioactivity of the Seγ source is 98Ci. A kind of radiographic detection method using two different gamma sources simultaneously in this embodiment, its specific steps are:

[0035] Step 1: Set up a radiographic detection system. The radiographic detection system includes 192 Ir flaw detector 1 and 75 Se flaw detector 2 (such as figure 1 shown), the specific process of setting up a radiographic detection system is as follows:

[0036] (A), will 192 One end of the Ir source pipe 9 and 75 One end of the Se source pipe 10 is closely attached to and fixed together in parallel, so that 192 Ir source pipe end 11 and 75 Th...

Embodiment 2

[0044] In this embodiment, both 192 Irγ source and Seγ source, take the central transillumination method to a 50m 3 The girth weld of the horizontal storage tank is subjected to radiographic inspection. The material of the storage tank is 16MnR, and the specification is φ2200×20mm. in use 192 The radioactivity of the Irγ source is 80Ci, 75 The radioactivity of the Seγ source is 92Ci. The specific steps of this embodiment are the same as in Embodiment 1, wherein the calculation of exposure time in step 2 is as follows: use the FC-Ⅲ gamma ray exposure calculator to calculate 192 Exposure time t of Irγ source for transillumination 1 8.3 points, used alone 75 Exposure time t of Seγ source for transillumination 2 It is 18.2 points, using the formula t=t 1 t 2 / (t 1 +t 2 ) calculated while using 192 Ir and 75 The exposure time of Seγ source for transillumination is 5.7 minutes. Using the FC-Ⅲ gamma-ray exposure calculator to calculate the exposure time for transillumina...

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Abstract

The invention belongs to the technical field of radiographic testing, and discloses a radiographic testing method with the simultaneous use of two different gamma sources. The radiographic testing method includes the following steps: a radiographic testing system is established, wherein the radiographic testing system includes a <192>Ir defectoscope and a <75>Se defectoscope; the exposure time is calculated: the exposure time for the transillumination of a workpiece by simply using a <192>Ir gamma source is calculated as t1 through a gamma ray exposure calculator, the exposure time for the transillumination of the workpiece by simply using a <75>Se gamma source is calculated as t2 through the gamma ray exposure calculator, and the exposure time needed for the transillumination of the workpiece by simultaneously using the <192>Ir gamma source and the <75>Se gamma source is calculated as t according to the formula t=t1*t2 / (t1+t2); the sources are sent, and a film is exposed: the film is exposed according to the determined exposure time t; the sources are withdrawn after the exposure time is over. The radiographic testing method provided by the invention has the advantages of wide transillumination thickness range, high radiograph resolution and testing sensitivity; the testing efficiency is improved greatly.

Description

technical field [0001] The present invention relates to the technical field of radiographic detection using gamma sources, more specifically, relates to a radiographic detection method using two different gamma sources at the same time, and the present invention is especially suitable for radiographing internal defects of butt welds of metal materials detection. Background technique [0002] In order to ensure the quality of manufacturing and installation of pressure-bearing special equipment such as boilers, pressure vessels, and pressure pipes, it is necessary to carry out radiographic inspection of butt welds during the manufacturing and installation process. Gamma-ray sources used in radiography are 192 Ir and 75 Se two, usually used alone 192 Ir or 75 Se gamma source for radiographic detection. [0003] 192 Irγ source is a traditional ray source for radiography detection. Its radiated ray spectrum consists of five spectral lines of 296kV, 338kV, 346kV, 468kV and 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/04
Inventor 魏民景卫东
Owner ANHUI SANXING TESTING
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