放ほう射しゃ性せい同どう位い核かくMeaningsNoun1. radioisotope (Rare)Kanji used放release射shoot性nature (of a person)同same位rank核nucleusComposed of放ほう射しゃ性せいradioactiveNoun同どう位いthe same rank; the same digitNoun核かくstone (of a fruit); pit; pip; core (of an organization, team, etc.); nucleus; heart; nuclear weapons; nucleus (of an atom); nucleus (of a cell); condensation nucleus; …Noun