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| background radiation; background radiation Radiation resulting from natural sources, as opposed to man-made sources, and to which people are exposed in everyday, normal life; for example from rocks and soil | |||
| ambient radiation | |||
| background | |||
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rayonnement ambiant : 7 phrases in 3 subjects |
| Environment | 1 |
| Natural resourses and wildlife conservation | 1 |
| Nuclear physics | 5 |
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