spinthariscope

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spin·thar·i·scope

 (spĭn-thăr′ĭ-skōp′)
n.
A device for observing individual scintillations produced by ionizing radiation, as one consisting of a tube with a magnifying lens at one end and a phosphorescent screen and speck of radioactive salt at the other.

[Greek spintharis, spark + -scope.]

spin·thar′i·scop′ic (-skŏp′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

spinthariscope

(spɪnˈθærɪˌskəʊp)
n
(General Physics) a device for observing ionizing radiation, consisting of a tube with a magnifying lens at one end and a phosphorescent screen at the other. A particle hitting the screen produces a scintillation
[C20: from Greek spintharis a little spark + -scope]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014