Geiger tube coincidence counter for lower atmosphere radiosonde measurements

Harrison, G. G. ORCID: https://orcid.org/0000-0003-0693-347X, Nicoll, K. A. ORCID: https://orcid.org/0000-0001-5580-6325 and Lomas, A. G. (2013) Geiger tube coincidence counter for lower atmosphere radiosonde measurements. Review of Scientific Instruments, 84 (7). 076103. ISSN 0034-6748 doi: 10.1063/1.4815832

Abstract/Summary

Atmospheric profiles of cosmic rays and radioactivity can be obtained using adapted meteorologi- cal 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 de- termine 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