How does a Geiger counter measure radiation levels? a. Radiation is absorbed by gas atoms, which undergo phosphorescence and emit a different radiation.
b. Radiation is absorbed by gas atoms, which undergo nuclear reactions and emit a different radiation.
c. Radiation knocks neutrons out of gas atoms, which causes the gas atoms to become unstable.
d. Radiation knocks electrons out of gas atoms, which allows the gas to conduct an electric current.