Author Retains CopyrightBarnett, Antony Ross2011-08-252022-10-302011-08-252022-10-3019601960https://ir.wgtn.ac.nz/handle/123456789/25832An improved method is described for measuring the range-ionisation relation for alpha particles in argon using a proportional counter with field adjusting tubes to eliminate the end effect. The operation of the counter is checked in detail and it is found that a theory of gas multiplication due to Keck is in good agreement with experiment. A possible extension to the measurement of the energy per ion pair variation with energy in argon is considered.pdfen-NZhttps://www.wgtn.ac.nz/library/about-us/policies-and-strategies/copyright-for-the-researcharchiveAlpha raysArgonAlpha particlesTextAll rights, except those explicitly waived, are held by the Author