Abstract

Argon-filled spark chambers (gap sizes 1.9 and 9.5 cm) operated under low gas pressures (80–300 torr) and short pulse lengths (30–120 ns) revealed spark tracks with a distinc structure (blobs) property. The blob density is found to be a function of the gas pressure and particle ionization. Results show that this mode of observation may be utilized with advantage particularly in large area cosmic ray experiments for the measurement of particle ionization.

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