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The Technique of Microradiography

 

作者: S. E. Maddigan,  

 

期刊: Journal of Applied Physics  (AIP Available online 1944)
卷期: Volume 15, issue 1  

页码: 43-54

 

ISSN:0021-8979

 

年代: 1944

 

DOI:10.1063/1.1707366

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Investigations have been made of the various factors considered to influence the sensitivity of the microradiographic method for the examination of alloys. Both target element and applied voltage influenced the results. Radiographs are shown to demonstrate the effect; an explanation is given in terms of the x‐ray emission curves and the absorption differential curves for the phases of the radiographed alloy. Target‐specimen distance was an important factor for uncollimated rays, particularly for distances of less than 6 in. with minute inhomogeneities or with low values for the absorption differential. The size of inhomogeneity, lower limit of absorption differential, and upper limit of magnification were also studied. For investigation of the distribution of elements in inhomogeneities, it was concluded that, contrary to previous reports, both target element and applied voltage must be carefully chosen after a study of the absorption differential curves. The optimum voltage range is usually 2.5 to 3.5 times the excitation potential.

 

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