Synonyms for Geiger counter:

n.

Geiger Counter (noun)
Geiger-muller Counter.
becquerel, alpha particle, Gamma rays, cosmic radiation, cosmic rays, atomic, half-life, carbon dating, fission.

Other synonyms:

Geiger-Muller counter
Geiger-muller Counter.
fission, cosmic radiation, Gamma rays, becquerel, half-life, carbon dating, cosmic rays. atomic.