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| the splitting of the nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy |
| a longitudinal wave in an elastic medium, especially a wave producing an audible sensation |
| proportional counter | |
| —n | |
| an instrument for detecting and measuring the intensity of ionizing radiation. It is similar to a Geiger counter but operates at a lower potential difference such that the magnitude of the discharge is directly proportional to the number of gas molecules ionized by the detected particle. This may permit the identification of the particle or the determination of its energy | |