These pulses are recorded on photomultiplier tubes, electronic sensors much more sensitive than the human eye.

The emitted light is filtered and detected by a photomultiplier tube.

These photons are then detected by the photomultiplier tube.

A photomultiplier tube noticed these drops in output and recorded them.

Many counters have two photomultiplier tubes connected in a coincidence circuit.

Phosphors in combination with photomultiplier tubes have also been used.

The article on the photomultiplier tube carries a detailed description of the tube's operation.

This is then amplified by photomultiplier tubes and converted into electrical impulses.

At opposing ends of the chamber were a pair of photomultiplier tubes.

One possible reason is that there is a problem with one of the photomultiplier tubes.