What type of radiation does a PRD detect?

The correct answer is that a Personal Radiation Detector (PRD) is capable of detecting gamma and neutron radiation isotopes. PRDs are designed specifically to identify and measure these types of ionizing radiation, which are significant in various contexts, including nuclear security, emergency response, and environmental monitoring.

Gamma radiation is highly penetrating and can travel through several centimeters of lead, making it a critical concern in many situations involving radioactive materials. Neutron radiation, while less common, is crucial to detect in scenarios that involve nuclear reactors or certain types of radioactive isotopes.

In contrast, the options that specify other types of radiation do not encompass the full capabilities of what a PRD can detect. For example, alpha radiation is typically detected by different types of instrumentation due to its limited penetrating power, and while X-rays and beta radiation are important in radiation detection, PRDs primarily focus on gamma and neutron radiation, making those options less accurate.