thank you very much for your kind answer but we are pretty expert in measuring radon-222 activity concentrations in different environmental matrices. what we are looking for is some informations about if a measurement of the radon partition coefficient has been ever made. thank you anyway
You may please go through one of our publication "A Study on Radon Absorption Efficiencies of Edible Oils Produced in India" . Karunakara N. and Darwish Al-Azmi Health Physics, 98(4), 621-627, 2010.
We have measured the coefficient of radon in edible oils. I think the same method can be applied for propane.