Illustration 1: The shadow of the antenna is another Geiger - Smart Geiger from private company Technonia - used to countercheck

From

Alpha-Emitting Nanoparticulates and Their Various Physical Effects: More Case Studies in Laboratory Research and History

Florent Pirot

Applied Mathematics and Physics. 2020, 8(1), 1-7 doi:10.12691/amp-8-1-1