What kind of devices typically use photomultiplier tubes?

Photomultiplier tubes (PMTs) are highly sensitive devices that detect low levels of light, making them particularly suitable for applications that require the detection of weak signals. In medical imaging systems, PMTs are commonly utilized due to their ability to amplify and detect the faint light produced by scintillators, which convert X-rays or gamma rays into visible light. This capability is essential in systems such as positron emission tomography (PET) and single-photon emission computed tomography (SPECT), where precision in detecting low levels of radiation is critical for accurate imaging.

While high-end audio systems, television screens, and display monitors involve various forms of light and audio technology, they do not generally employ photomultiplier tubes as part of their standard functioning. Instead, these devices typically use different technologies tailored to their specific application needs. The high sensitivity and signal amplification characteristics of PMTs make them ideal for environments where minimal light levels are prevalent, particularly in medical applications.