Method for preparing exposure curve for radiographic inspection

A technology of exposure curve and production method, which is applied in optics, measuring device, sensitivity measurement process, etc., can solve the problem of time-consuming and labor-intensive processing, and achieve the effect of saving time and labor and saving film.

Inactive Publication Date: 2013-09-04
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The exposure curve needs to be transilluminated multiple times. Under each exposure, 7~10 different negatives need to be transilluminated. Calculated according to 6 curves in each group, about 50 negatives need to be transilluminated. Multiple times of developing time-consuming strenuous

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  • Method for preparing exposure curve for radiographic inspection
  • Method for preparing exposure curve for radiographic inspection
  • Method for preparing exposure curve for radiographic inspection

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] 1. Exposure:

[0021] Under the condition that the X-ray machine, film, intensifying screen, focal length, and darkroom processing conditions remain unchanged, the ladder test block 1 is transilluminated at a fixed exposure (mA·min). Before the transillumination, the film 3 is pressed under the stepped test block 1, and at the same time, the radiation dosimeter 4 capable of measuring the cumulative dose is placed under the steps 2 of different thicknesses of the stepped test block 1, and the cumulative dose data is cleared. Different cumulative doses Corresponds to the thickness of the corresponding stepped test block 1. The image quality meter and intensifying screen are placed according to normal transillumination exposure.

[0022] 2. Post-exposure treatment

[0023] Rinse and dry the exposed film 1, and use a blackness m...

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Abstract

The invention discloses a method for preparing an exposure curve for radiographic inspection. The method comprises the following steps of (1) placing films and X-ray dosimeters on a stair test block; (2) exposing; (3) washing and drying the exposed films, utilizing a nigrometer to measure blackness values of negative films, reading accumulated doses corresponding to the blackness values to obtain a group of blackness values, and then finding an accumulated variable H corresponding to a standard blackness; (4) transilluminating a testing block to be detected with certain thickness under different transillumination conditions, stopping the transillumination when the accumulated variable is H, and recording light exposure at the time; (5) repeating the step (4) for multiple times to obtain a plurality of groups of light exposure under different transillumination conditions; (6) obtaining the exposure curve according to the thickness, the blackness values and the transillumination conditions of the transilluminated testing block to be detected with the certain thickness. According to the method for preparing the exposure curve for radiographic inspection, based on a relative relation between the blackness and the light exposure, the exposure curve can be obtained by only developing the films once, so that a plurality of films can be saved, and time-saving and labor-saving operation can be realized.

Description

[0001] technical field [0002] The invention relates to a curve making method for radiation detection. Background technique [0003] Exposure curve is an effective tool for radiographers to correctly select exposure parameters to obtain radiographs required by standard blackness and image quality sensitivity. It represents the curve of the correlation between the workpiece and the process specification. The exposure curve of a radiation source is different under different process and environmental conditions. Therefore, the already made exposure curve is only applicable to the same state as the specific conditions at that time, otherwise a new exposure curve should be made. The exposure curve needs to be transilluminated multiple times. Under each exposure, 7~10 different negatives need to be transilluminated. Calculated according to 6 curves in each group, about 50 negatives need to be transilluminated. Multiple times of developing time-consuming strenuous. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B42/02G03C5/02G01N23/00
Inventor 刘长福牛晓光郝晓军赵继峰
Owner STATE GRID CORP OF CHINA
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