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Updated: May 9, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
Note: Geiger tube coincidence counter for lower atmosphere radiosonde measurements
R G Harrison1, K A Nicoll, A G Lomas
1Department of Meteorology, University of Reading, Reading RG6 6BB, United Kingdom.
Abstract:
Atmospheric profiles of cosmic rays and radioactivity can be obtained using adapted meteorological radiosondes, for which Geiger tubes remain widely used detectors. Simultaneous triggering of two tubes provides an indication of energetic events. As, however, only small volume detectors can be carried, the event rate is small, which, due to the rapid balloon ascent, cannot be circumvented using long averaging periods. To derive count rates at low altitudes, a microcontroller is used to determine the inter-event time. This yields estimates of the coincidence rate below 5 km, where the coincidence rate is too small to determine solely by event counting.
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