Abstract
The volatilization of polonium from bismuth oxide was measured by a transport method between 580°C and 780°C. The apparent vapor pressure, π, which is deffined as the observed partial pressure of polonium divided by the mole fraction of polonium in bismuth oxide was found to be represented by log π (atm) = −15·51 × 10 3 T + 11·83 over a mole fraction range of polonium between 10 −8 to 10 −5. A comparison is made of the measured apparent vapour pressure with the partial pressure of polonium in the polonium-bismuth system and the vapour pressure of pure polonium metal.
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