Abstract
A moving coil microammeter of relatively long period is used to integrate the current obtained in an intermittent glow discharge in a rare gas. This gives an indication of the intensity of any ionising radiation which produces an increase in the frequency of the discharges, in the “counting region” between the breakdown potential of the gas and the onset of relaxation oscillations. The method is sufficiently sensitive for the direct detection of cosmic radiation. A description is given of a portable instrument embodying this principle, using headphones to make audible the discharges, which may be employed for the location of lost radium. The application of the method to the measurement of gamma ray activity of radioactive substances, and of the tolerance dose of scattered X rays, is discussed.
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