Which type of radiation detection device uses a phosphor-coated surface to detect radiation?

a. scintillation counter

b. Geiger counter

c. film badge

In the choices above, the correct letter of the question is letter a, scintillation counter. It is because it uses a phosphor-coated surface in order to use its function in detecting radiation. Its component could produce bright flashes where it will be sufficient in detecting the radiation.