Abstract
IT is well known that the short-lived atoms of radium A, B, C, and Câ² are deposited on the surfaces of objects which come in contact with radon. Three of them, namely, radium A, C and Câ², emit alpha rays. The emulsion of a photographic plate is blackened by these alpha particles. Their range in the emulsion is very short (maximum 50 µ). The geometric properties of the surface, for example, differences in the distance of various points of the surface of the object from the emulsion, cause a different blackening due to the alpha emission of the deposit on the surface. This enables us to develop a radiographic method which gives in a simple way a picture showing the structure of the surface.
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JECH, Ä. Surface Radiography with Alpha Rays. Nature 161, 314 (1948). https://doi.org/10.1038/161314a0
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DOI: https://doi.org/10.1038/161314a0
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