  A small scintillator-based detector for atmospheric ionization measurements
has been developed, partly in response to a need for better ionization data in
the weather-forming regions of the atmosphere and partly with the intention of
producing a commercially available device. The device can measure both the
count rate and energy of atmospheric ionizing radiation. Here we report results
of a test flight over the UK in December 2017 where the detector was flown with
two Geiger counters on a meteorological radiosonde. The count rate profile with
height was consistent both with the Geigers and with previous work. The energy
of incoming ionizing radiation increased substantially with altitude.
