Abstract
The long dead time and cathode erosion of the Rosenblum corona-spark counter for heavily ionizing radiations have been overcome by forming only the streamer stage of the spark by the addition of a few percent of some diatomic gas to nitrogen-contaminated argon in corona detectors of coaxial wire-cylinder geometry. The amplitude of the streamer pulse at the anode wire is large (>10 v) and distinctly greater than background, with a risetime of about 1 μsec. The recovery of the anode potential is made rapid (typically 5 μsec) by a simple RC anode circuit. Efficiencies for streamer formation of 7.5% for U234 α particles, 1.5% for (n, B10) α's and 5% for (n, U235) fission fragments have been obtained in coated counters.
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