| 21. | The station, Project Magnet, was equipped with radio monitoring equipment, Geiger counters and cameras.
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| 22. | Ionization chambers and Geiger counters were first adapted for field use in the 1930s.
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| 23. | One day, while walking under the university's stadium seats, his Geiger counter ticked frantically.
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| 24. | The sound of a Geiger counter is a recurring leitmotif.
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| 25. | Commercially made Geiger counters are expensive and require frequent calibration.
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| 26. | This is the distinctive sound normally associated with hand held or portable Geiger counters.
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| 27. | Thirty years ago, my Geiger counter was clicking about the beginning of the women's movement.
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| 28. | Should I keep my Geiger counter running during dinner?
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| 29. | Naturally, a geiger counter should register this low effect.
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| 30. | It was an early version of the Geiger counter.
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