The ranges of α particles in photographic emulsions

Taylor, H. J. ; Dabholkar, V. D. (1936) The ranges of α particles in photographic emulsions Proceedings of the Physical Society, 48 (2). pp. 285-298. ISSN 0370-1328

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Numerous α-particle tracks on Ilford R plates have been measured. From measurements of the tracks of a homogeneous group of a particles of range R, a distribution curve may be drawn, from which a length L, known as the extrapolated length of the tracks, can be determined. The ratio L/R is shown to be constant to within 1 per cent for a particles of various ranges, and hence R can be found for a group of unknown tracks if L is measured. The method is applied to determine the ranges corresponding to the tracks produced by the disintegration of boron and lithium under slow-neutron bombardment. These are found to be 1.14±0.02 cm. in air and 6.64±0.06 cm. in air, respectively. Samarium has also been investigated, and is found to emit a particles of range 1.13±0.02 cm. in air. Other particles from samarium, of longer range, have also been found.

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