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- Title
Radioactivity of Samarium and the Formation of Hibernium Halos.
- Authors
POOLE, J. H. J.
- Abstract
IN their interesting communication to NATURE for March 25, p. 434, G. Hevesy and M. Pahlhave referred to Joly's work on the so-called hibernium halos. The agreement between their determination of the range of the α-ray radiation of samarium and Joly's1 value is very striking. He found that the air equivalent of the radius of a hibernium halo was 1.15 cm., which may be compared with their figure for the range of the samarium α-ray of 1.1 cm. In his final estimate of the range of the hibernium α-ray Joly gave 1.5 cm. This figure was arrived at from the fact that in a normal positive uranium halo the boundary of the halo does not coincide exactly with the full range of the α-ray, due to the decreasing ionising power of the ray very near the end of its path. It must be remembered, however, that all the hibernium halos observed were reversed halos, and, as is shown later, it is probable that some non-radioactive reversal and intensification effect is necessary to render them visible, if they are samarium halos. Under these conditions it is possible that the radius of the halo would give practically the full range, which would thus agree nearly exactly with the samarium α-ray range.
- Publication
Nature, 1933, Vol 131, Issue 3314, p654
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/131654b0