Longman Dictionary of Contemporary English - geiger counter
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Geiger counter
geiger counter
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1.
(Geiger counters) A Geiger counter is a device which finds and measures radioactivity. N-COUNT ...Collins COBUILD Advanced Learner's English Dictionary
2.
noun Etymology: Hans Geiger died 1945 German physicist Date: 1924 an instrument for detecting the presence and intensity of radiations (as cosmic rays or particles from a radioactive substance) by means of their ionizing effect on an enclosed gas which results in a pulse that is amplified and fed to a device giving a visible or audible indication ...Merriam-Webster Collegiate Dictionary
3.
n. a device for measuring radioactivity by detecting and counting ionizing particles. Etymology: H. Geiger, Ger. physicist d. 1945 ...Толковый словарь английского языка Oxford English Reference
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