Abstract
A RADIOGRAPH of a lead disc 2.5 mm. thick, raised above the plate, does not, as might be expected, appear of an even intensity, but gives well within its shadow a distinct white ring. The area inside this ring is grey, and the annular space outside it dark. Experiment has shown that its brightness, width, and diameter vary with the distances of the disc from the plate and antikathode. It also changes from a complete circle to almost a semi-circle, the position and dimensions of the absent arc depending upon the orientation of the bulb.
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CHAMBERS, W., RANKIN, I. Asymmetric Haloes with X-Radiation. Nature 93, 507 (1914). https://doi.org/10.1038/093507b0
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DOI: https://doi.org/10.1038/093507b0
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