Noun
radioactive isotope of thorium with mass number 228
Source: WordNetAt the session of the Royal Society on the 16 March 1905 Ramsay communicated Hahn's discovery of radiothorium, and even the press was interested. Source: Internet
Research in London and Montreal (1904–1906) Discovery of radiothorium and other 'new elements' Sir William Ramsay, London 1905 Ernest Rutherford at McGill University, Montreal 1905 Hahn's intention had been to work in industry. Source: Internet