noun🔗Share放射能Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus."The old watch contained radium, which caused its hands to glow in the dark due to radioactivity. "古い時計にはラジウムが含まれており、放射能によって暗闇で針が光っていました。physicsenergysubstancechemistryenvironmentsciencematerialChat with AIVocabulary GamePractice Reading
noun🔗Share放射能、放射線The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc."The radioactivity from the old smoke detector is dangerous and should be disposed of properly. "古い煙感知器からの放射能は危険なので、適切に処分する必要があります。physicsenergysubstancescienceChat with AIVocabulary GamePractice Reading
