Abstract
THE decay of the positron-emitters aluminium-26, aluminium-25 and nitrogen-13 was measured using a nine-channel sealer, which recorded the counts received from a Geiger–Müller tube in nine successive equal periods. These periods were 2 sec. each for the two aluminium isotopes and 200 sec. each for the nitrogen isotope. The isotopes were produced by resonant capture of protons by magnesium-25, magnesium-24 and carbon-12, respectively. The proton beam was switched off when counting began, and the switching from one channel to the next was done by an electronic timer, accurate to one part in a thousand.
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CHURCHILL, J., JONES, W. & HUNT, S. Half-value Periods for the Decay of Aluminium-26, Aluminium-25 and Nitrogen-13. Nature 172, 460 (1953). https://doi.org/10.1038/172460a0
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DOI: https://doi.org/10.1038/172460a0
