Abstract
THE relative velocities of the α-particles from thorium X, thoron, thorium A, thorium C, thorium Ć and radium Ć have been measured by the direct magnetic deflection method using a permanent magnet1 giving a field of about 5,000 gauss. The deflections were measured with a microphotometer, and by carefully investigating possible sources of error such as loss of velocity by absorption at the source, non-uniformity of the magnetic field, and the effect of any movements of the photographic emulsion during development, it has been possible to obtain a considerable improvement in the accuracy of measurement of α-ray relative velocities.
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References
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BRIGGS, G. Velocities of Emission of α-Particles. Nature 130, 1000 (1932). https://doi.org/10.1038/1301000a0
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DOI: https://doi.org/10.1038/1301000a0
