spinthariscope
/spɪnˈθærɪˌskoʊp/
noun
- A device that shows the radioactive decay of a substance by displaying tiny flashes of light on a screen coated with a phosphor, used for educational or scientific demonstration.
- Early scientists were amazed by the spinthariscope's ability to make invisible radiation visible.
- The teacher used a spinthariscope to show the class how radioactive particles create tiny sparks.
- In the museum, visitors could look into a spinthariscope and see the faint flashes from a radium source.