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Meaning of Geiger-Müller threshold

Gei'ger-Mül'ler thresh"old

Pronunciation: (gī'gur mul'ur, -my'lur), [key]
— Physics. Physics.
  1. the minimum voltage applied to an ionization chamber, as in a Geiger counter, at which the charge collected per count is independent of the nature of the ionizing event producing the count. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.