Abstract
IN continuation of my letter on this subject in NATURE of April 22, p. 517, fifty additional measurements of the small Ytterby haloes have been made. The same consistency among the readings is noticeable. The mean result is a radius of 0.0052 mm. Introducing two corrections not previously applied (for the somewhat higher stopping power of this mica and for the fact that in such measurements we do not generally deal with the extreme range) I find that the range in air might be as much as 1.4 or even 1.5 cm. The nuclear correction would reduce this a very little.
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JOLY, J. Haloes and Earth History. Nature 109, 578–579 (1922). https://doi.org/10.1038/109578b0
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DOI: https://doi.org/10.1038/109578b0
