Abstract
I ENCLOSE two prints I have taken with a radium screen. No. 1 shows the impression of a steel pen-nib, a steel screw, and an ordinary paper fastener. These articles were laid on a photographic plate and exposed for 6 days. No. 2 shows the impression of two bronze coins (halfpennies) similarly placed, but exposed for 131/2 days. One coin rests partly on the other, and at this part the edge of the lower coin is very much blurred, pointing to rather great secondary radiation from the upper coin.
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DAVIS, J. Secondary Radiations of Radium. Nature 69, 489 (1904). https://doi.org/10.1038/069489f0
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DOI: https://doi.org/10.1038/069489f0
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