Geiger-Müller tube

noun Physics.

a tube functioning as an ionization chamber within a Geiger counter.

Also called Geiger tube.

Origin:
1925–30; see Geiger-Müller threshold

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Geiger-müller tube is always a great word to know.

So is nuclear radiation. Does it mean:

radiation in the form of elementary particles emitted by an atomic nucleus produced by decay of radioactive substances or by nuclear fission

to be reflected many times, as sound waves from the walls of a confined space

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