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A counter which combines large solid angle, low operating voltage, ease of changing source, and ability to detect particles of very low energy is described. By means of a revolving plate a sample may be rotated to a position inside the counting chamber through which helium is slowly passing. A large solid angle with low operating voltage is achieved by placing side by side several semicylindrical cathodes whose central wires are electrically connected. Fe55, which has a half-life of four years, was used as a sample with which to examine the operational characteristics of the counter.

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