Actinium bromide

Curies and who called it actinium, and by Giesel/ who called it emanium. Giesel obtained a radium preparation nearly free from barium by recrystallising the bromide only six or eight times. He found that it gave a carmine-red flame coloration. ... 

Friedrich Ernst Dom in 1900. He used the same apparatus as Rutherford with thorium emanation and confirmed this. Using radium bromide he found a similar emanation, which did not penetrate aluminium as Rutherford (incorrectly) said thorium emanation did. Some doubts about the existence of radium emanation were removed by Rutherford and Soddy, who liquefied it by cooling in liquid air, and by Ramsay and Collie, who determined its spectrum. R. W. Gray and Ramsay determined its density by weighing on a microbalance and proposed for it the name m/on, shining . Actinium emanation was discovered by Debieme and by Giesel. The modem names thoron, radon, and actinon were proposed by W. Schmidt. ... 

---