Final answer:
The most commonly used types of AEC devices for radiation detection and measurement include Geiger counters, scintillation counters, and radiation dosimeters, with photomultiplier tubes serving as crucial components in scintillators.
Step-by-step explanation:
The most commonly used type of Automatic Exposure Control (AEC) devices in the context of radiation exposure and detection are Geiger counters, scintillation counters (scintillators), and radiation dosimeters. Geiger counters are renowned for their ability to measure radiation through the ionization of gas in a tube, with the rate of ionization being proportional to the radiation level. Scintillation counters, which include scintillators and photoelectric sensors like photomultiplier tubes, emit light when excited by ionizing radiation; this light is then converted into electrical signals, offering sophisticated information about the radiation. Lastly, radiation dosimeters are frequently used types for personal radiation exposure measurement, utilizing technology such as electronic, film badge, thermoluminescent, and quartz fiber dosimeters.