Which statement best describes the PDR-77's capabilities?

• A. It detects alpha, beta, gamma, and x-ray
• B. It surveys food and water
• C. It is handheld
• D. It detects neutron/gamma dose and gamma dose rate

Answer: (A)

The main idea here is what the device can detect in the field. The PDR-77 is designed as a versatile handheld radiation detector that can sense multiple radiation types, specifically alpha, beta, gamma, and x-ray radiation. This broad detection capability makes it suitable for quickly screening unknown sources in real-time. Other statements describe uses that aren’t about what the instrument detects—surveillance of food and water involves contamination testing rather than live radiation readings, and being handheld is a form factor rather than a capability. Neutron detection would require a different sensor setup, so that description doesn’t fit this device.