Sir William Ramsay worked with Frederick Soddy to demonstrate, in 1903, that alpha particles (helium nuclei) were continually produced during the radioactive decay of a sample of radium.
Sir William Ramsay bekerja dengan Frederick Soddy untuk menunjukkan, pada tahun 1903, bahwa partikel alfa (inti helium) terus diproduksi selama peluruhan radioaktif sampel radium.