Final answer:
An automatic exposure control (AEC) device in an x-ray table typically contains three detectors. These detectors automate the exposure process to achieve optimal image quality while ensuring patient safety.
Step-by-step explanation:
An automatic exposure control (AEC) device in an x-ray table typically contains three detectors. These detectors are positioned to measure the amount of x-ray exposure and ensure that the appropriate amount is used to create an image that has sufficient quality without overexposing the patient. When the correct level of x-ray exposure is reached, the AEC system automatically terminates the exposure.
It's important to note that the AEC's detectors are neither Geiger counters, scintillators, nor dosimeters, which are described in the reference images and are used to measure radiation in various contexts. AECs specifically refer to x-ray imaging technology and the automation of exposure to achieve optimal image clarity and patient safety.