A Calculation Method of Exposure Curve for Gamma Ray Detection
A technology of exposure curves and calculation methods, applied in optics, instruments, photography, etc., can solve the problems of cumbersome operation and long query time, and achieve the effect of simple query, easy promotion, and less time-consuming
Active Publication Date: 2018-10-30
HANGZHOU HANGGUO INDUSTRIAL BOILER CO LTD
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[0018] c) The operation is more cumbersome, and the entire query time takes more time;
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[0059] The present invention will be described in detail below in conjunction with accompanying drawing: a kind of gamma ray detection exposure curve calculation method of the present invention, described exposure curve calculation method is:
[0060] (1) Acquisition of basic parameters; use the following equipment to obtain basic parameters: gamma ray generator required to make curves, several dark bags with film, 1 piece of ladder test block for ray, and backing plate (10mm thick) 1~ 3 pieces, 1 tape measure, 1 blackness meter;
[0061] Steps to get basic parameters:
[0062] a) Use a longer time t 1 and a shorter time t 2 , focal length F 0 Fix, the darkroom processing process is all fixed, take a step test block, get two negatives at different times, use a blackness meter to measure the data under two time exposures to obtain the transillumination thickness and the corresponding blackness, and draw two D-T curves, See figure 2 shown;
[0063] b) Select a reference b...
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An exposure curve calculation method for gamma ray detection, the exposure curve calculation method is: (1) obtaining basic parameters; using relevant equipment to obtain basic parameters, the specific steps for obtaining basic parameters are: a) using a longer time t1 and For a short time t2, the focal length F0 is fixed, the darkroom processing process is all fixed, the step test block is shot, two negatives at different times are obtained, and the data under the two time exposures of the transillumination thickness and the corresponding blackness are measured by a blackness meter. Draw two D-T curves; b) select a reference blackness value, and find out the transillumination thickness corresponding to the blackness from the D-T curve. Obtain the transillumination thickness values T1 and T2 corresponding to the exposure of the longer time t1 and the shorter time t2; (2) Theoretical derivation of the exposure curve calculation method, in which the attenuation formula of rays and the reciprocity law formula are used to calculate and finally obtain the photographed The exposure time t3 required when the blackness of the film is the reference blackness value of 3.0.
Description
technical field [0001] The invention relates to an exposure curve calculation method for gamma ray detection, which belongs to the technical field of film ray detection in nondestructive testing. Background technique [0002] Radiographic testing is the most widely used and common method of ray testing, and it is also the most reliable means of nondestructive testing. It has been widely used in various fields of economic construction in my country, such as manufacturing and in-use testing of special equipment, and , metallurgy, oil and gas, chemical industry, aerospace, shipbuilding, railway, electric power, nuclear industry, weapons, coal, non-ferrous metals, construction and other industries. [0003] The imaging quality of the negative film in the film radiographic inspection completely determines the detection result. In order to obtain a better negative film, the radiography process must be continuously improved. The γ-ray filming process mainly includes source type, so...
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IPC IPC(8): G03B42/00
CPCG03B42/00
Inventor 安发顺陈涛
Owner HANGZHOU HANGGUO INDUSTRIAL BOILER CO LTD