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| Cherenkov detector | Apparatus through which it is possible to observe the existence and velocity of high-speed particles important in experimental nuclear physics and in the study of cosmic radiation. It was originally built to investigate the Cherenkov radiation effect, in which charged particles travel through a medium at a speed greater than that of light in that medium. |
| GIS | Gas Imaging Spectrometer (ASCA X-ray satellite). |
| scintillation counter | A device used with a photomultiplier tube to detect or count charged particles or gamma rays. |
| scintillator | A detector for high-energy photons such as gamma-rays. The impact of a gamma-ray causes a burst of light which can be observed with a PMT. |
| spark chamber | A means of detecting high energy particles by the trail of ionizations left as they pass through a chamber containing many charge plates. |
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