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For a single radioactive decay process, the time required for the activity to decrease to half its value by that process., aeg, mille jooksul radioaktiivse lagunemise käigus aktiivsus väheneb pooleni esialgsest
radionukliidi poolestusaeg . Meditsiinifüüsika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mef/radionukliidi%20poolestusaeg/1/est (27.07.2026)
