The AN/PDR-77 Radiac Set is portable radiation detection equipment that uses probes to detect which types of radiation?

The AN/PDR-77 Radiac Set is designed to detect specific types of radiation, utilizing probes that are sensitive to a range of radiation forms. The correct answer highlights the set's capability to identify alpha particles, beta particles/gamma radiation, and x-rays.

Alpha radiation consists of positively charged particles, which the AN/PDR-77 can detect due to its specialized probes designed to interact with this particle type. Beta and gamma radiation can also be detected, as the instrument is calibrated for a broad spectrum of radiation detection, including gamma rays, which are high-energy electromagnetic waves. X-rays, although similar to gamma radiation, are produced rather differently and are also within the detection capabilities of this set.

Other choices include different combinations of radiation types that do not accurately capture the AN/PDR-77’s detection capabilities. The detection of neutron radiation, for instance, is not a function of the AN/PDR-77, as neutrons require specific types of detectors that are not addressed in this equipment. This makes the identification of beta/gamma and x-ray detection as the primary functions of the AN/PDR-77 essential. Such clarity on the capabilities of the instrument helps in understanding its use in reconnaissance operations where identifying multiple radiation types is crucial for safety