Pressure Regulated Thin Window Geiger-Mueller Counter

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Abstract
The use of very thin Zapon or Formvar windows for G‐M counter tubes in beta‐spectroscopy is limited by the fact that the filling mixture of the counter diffuses or leaks through the window, which forbids the use of very thin windows. A pressure regulator is described which will permit the maintenance of a constant pressure of filling mixture even if the window of the counter allows the slow escape of the gas. A thin window G‐M counter presenting some improvements is also described.
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