Abstract
REFERRING to Mr. Hardy's experiment described in his letter in NATURE, October 8, it is easy to show that whatever the intensity of radio-activity might be at the surface of the sun, by mere surface ratios and assuming no absorption its activity, per unit area at the distance of the earth must fall to about one forty-thousandth part. Now, if the sun were composed of solid radium bromide, the radiation reaching Mr. Hardy's indicator from the sun will be only about one-thousandth part of that derived from a sphere of radium bromide three millimetres in diameter and twenty millimetres distant from the indicator: the probable conditions of Mr. Hardy's experiment.
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JOLY, J. Radium and the Sun's Heat. Nature 68, 572 (1903). https://doi.org/10.1038/068572b0
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DOI: https://doi.org/10.1038/068572b0
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