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| Arabic | English |
| نشاط إشعاعي | radioactivity The property possessed by some atomic nuclei of disintegrating spontaneously, with loss of energy through emission of a charged particle and/or gamma radiation |
| نشاط إشعاعي طبيعي | natural radioactivity Radiation stemming mainly from uranium, present in small amounts in many rocks, soils, building material, etc. |