Geiger counter - Wikipedia

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Is a Geiger counter sensitive enough to measure contaminated surfaces? If the Geiger counter doesn't detect anything, is the measured object considered safe? - Quora

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PPT - History of Particle Detectors PowerPoint Presentation, free download - ID:9554302

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Measuring Radiation: An Overview of the Principles and Applications of the Geiger-Müller Counter, PDF, Ionizing Radiation

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Geiger counter