Abstract
Polonium-210 can easily be obtained by separating it from neutron-irradiated bismuth. A study was made of a suitable method of separating polonium from bismuth by spontaneous deposition. It was found that polonium-210 is quantitatively deposited on a silver plate when 0.1 ml of a 0.11.2 N HNO3 solution containing polonium and bismuth is contacted with the silver plate for 1 hour or more. If the amount of bismuth is more than 1 gram in 25 ml of polonium solution, the deposition-rate of polonium decreases.
