(1) Radioaktiivne aine on üht või enamat radionukliidi sisaldav aine, mille aktiivsus või aktiivsuskontsentratsioon on kiirgusohutuse seisukohalt oluline.
defineeritakse kõikide Eesti õigusaktide ulatuses
(1) Radioactive substance is any substance that contains one or more radionuclides and which activity or activity concentration is important from the radiation safety point of view.
defined within the scope of all Estonian legal instruments
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