Most people have heard of a "Geiger Counter" for measuring radioactivity. This is actually a Geiger-Müller tube with some form of counter attached, which usually tells us the number of particles detected per minute ("counts per minute").
GM tubes work using the ionising effect of radioactivity. This means that they are best at detecting alpha particles, because -particles ionise strongly.
Different models of GM tubes are available for
detecting , and radiation.