All methods of detection are based on the ability of radiation to ______.

All methods of detection are based on the ability of radiation to ______.

• A. Cause ionization
• B. Absorb heat
• C. Change nuclear spin
• D. Emit photons

Answer: (A)

Detectors get a measurable signal when radiation interacts with a material and creates free charge carriers. Ionization—knocking electrons off atoms—produces electrons and positive ions that can be collected by an applied electric field to form a current or pulse. This charge collection is the common mechanism behind many detector types: gas-filled counters rely on the collected charge, semiconductor detectors sense electron-hole pairs, and even light-producing detectors ultimately reflect the energy deposited by ionizing interactions. While some detectors use heating or other effects, the signal in most practical detectors hinges on the radiation’s ability to ionize matter and generate detectable charge.

Detectors get a measurable signal when radiation interacts with a material and creates free charge carriers. Ionization—knocking electrons off atoms—produces electrons and positive ions that can be collected by an applied electric field to form a current or pulse. This charge collection is the common mechanism behind many detector types: gas-filled counters rely on the collected charge, semiconductor detectors sense electron-hole pairs, and even light-producing detectors ultimately reflect the energy deposited by ionizing interactions. While some detectors use heating or other effects, the signal in most practical detectors hinges on the radiation’s ability to ionize matter and generate detectable charge.