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A Geiger counter was a piece of technology involving radiation that made a ticking noise. The First Doctor considered it to be advanced technology. It included a needle on a scale that could reach a "danger point". (TV: "The Survivors")
A Geiger counter was used on Recovery 7 when it was brought back to Space Control. It detected levels of radiation in the ship's interior which were so high that its setting was on maximum. (TV: The Ambassadors of Death)
The Daleks made use of one, and the Doctor, Susan Foreman and Ian once encountered it on Skaro. It showed them the excess radiation there, which resulted in a jungle being turned to stone, the soil becoming barren, and sickness among the three. (TV: "The Survivors")
The equipment of the soldiers of the Combined Galactic Resistance was provided with such technology. It helped to diagnose a radiation leak as the cause of malfunctioning of a Dalek. (TV: Into the Dalek)