The PDR-77 is capable of detecting radiation types?

• A. Alpha, beta, gamma, and x-ray
• B. Detects neutron dose and gamma dose rate
• C. Measuring residual gamma
• D. Handheld

Answer: (A)

Detection capability across radiation types depends on detector design, specifically how a device can respond to charged particles as well as photons. The PDR-77 is built to sense alpha and beta particles with a suitable entrance window and detector material, while also detecting gamma and X-ray photons with a dense, photon-sensitive detector. This combination lets it register a broad range of radiation types, making it capable of detecting alpha, beta, gamma, and X-ray.

Neutron detection requires a different technology, so that option doesn’t describe the PDR-77’s capabilities. Measuring residual gamma refers to a narrower scope, and “handheld” describes form factor, not the types of radiation detected.