Individual electrons detected after the interaction of ionizing radiation with gases

Details Individual electrons detected after the interaction of ionizing radiation with gases Individual electrons detected after the interaction of ionizing radiation with gases

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.295..678s&link_type=abstract

Nature, vol. 295, Feb. 25, 1982, p. 678, 679. Research supported by the Science and Engineering Research Council.

Astronomy and Astrophysics

Astronomy

10

Electron Emission, Energetic Particles, Gas Mixtures, Pair Production, Particle Interactions, X Ray Irradiation, Argon, Carbon Dioxide, High Energy Interactions, Ion Emission, Ion Production Rates, Methane, Proportional Counters, X Ray Astronomy

Scientific paper

An observation that light signals emitted by a parallel-plate proportional counter are fast enough to allow the individual electrons in the ionization cluster to be resolved is reported. Light impulses emitted by Townsend avalanches in the counter were detected by a PMT, with the duration of the light signal set as the time for the initial electron cluster to cross the grid separating the drift and avalanche regions of the counter. CH4 and CO2 were used in the gas mixture to avoid secondary electron emission processes, and a low field strength was used in the drift region. C-K X-rays were taken of several single electron events, and estimates of the initial electrons, assuming a Fano factor and the electron pair charge, matched well with the electrons observed. The technique is stressed to improve energy counting resolution by a factor of two, and have applications in low energy X-ray astronomy and charged particle physics.

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