Which of the following devices can be used for radiation detection?

The Geiger-Muller counter is specifically designed for detecting and measuring ionizing radiation. It operates by counting the ion pairs created when radiation passes through a gas-filled tube, which allows it to detect alpha, beta, and gamma radiation. This characteristic makes it a valuable instrument in radiation safety, allowing users to monitor radiation levels and ensure safe environments in medical, industrial, and research settings.

Infrared thermometers, while useful for measuring temperature, do not detect radiation. They work by sensing infrared energy emitted from objects. Ultrasonic scanners use sound waves to create images of internal structures, such as organs, but are not related to radiation detection. Magnetic resonance imagers also do not detect radiation; instead, they use strong magnetic fields and radio waves to generate images of the body's internal structures.

Thus, the Geiger-Muller counter is the only device listed that is capable of specifically detecting radiation, making it the correct answer.