spinthariscope in English
noun
1
an instrument that shows the incidence of alpha particles by flashes on a fluorescent screen.
In 1903 he invented the spinthariscope to detect alpha particles emitted by radioactive elements.
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1. Sir William Crookes The English chemist and physicist Sir William Crookes (1832-1919) discovered the element thallium and invented the radiometer, the spinthariscope, and the Crookes tube