Photomultiplier Tube

A photomultiplier tube (PMT) is a highly sensitive device that detects very faint light signals. When light enters the tube, it hits a special surface called a photocathode, releasing electrons. These electrons are then multiplied through a series of internal electrodes, producing a large electric signal from a tiny amount of light. This makes PMTs useful in scientific applications like medical imaging, astronomy, and particle physics, where detecting weak light signals with high precision is essential. Essentially, a PMT transforms tiny flashes of light into measurable electrical signals for analysis.