Alpha Decay Alfalagunemine Beta Decay Beetalagunemine Beta Particle Beetaosake Critical Mass Kriitiline Mass Gray (unit) Grei Half-life Poolestusaeg Henri Becquerel Henri Becquerel Ionizing Radiation Ioniseeriv Kiirgus Marie Curie Marie Curie Mutagen Mutageen Nuclear Fission Tuumalõhustumine Pierre Curie Pierre Curie Radioactive Decay Radioaktiivsus Radiocarbon Dating Radiosüsiniku Meetod