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natural radioactivity; natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. | |||
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natural radioactivity | |||
natural activity |
naturliche Radioaktivitat: 4 צירופים, 3 נושאים |
גיאופיזיקה | 1 |
מחקר ופיתוח | 1 |
מכשירי חשמל | 2 |