spintariskop

listen to the pronunciation of spintariskop
التركية - الإنجليزية
spinthariscope
A small instrument containing a minute particle of a radium compound mounted in front of a fluorescent screen and viewed with magnifying lenses
{i} device for detecting alpha particles (Physics)
an early device used for observing individual nuclear disintegrations
The tiny flashes produced by the continual bombardment of the screen by the α rays are thus rendered visible