Techniques for absolute beta-counting of corrosive gases containing P-32 have been developed and applied to the determination of the vapor pressure of PF5. Standard, end-window G-M tubes were used; the PF5 was contained in a separate gas cell having an aluminum window and body. Various factors required to convert counting rates to disintegration rates were determined; accuracy of the product of these was evaluated by comparison counting. Absolute activity values that were derived from gas counting data and an equation for the vapor pressure of PF5 agreed with the activity measured from counting solid samples within 1.0 percent. The methods here developed are applicable to other phosphorus compounds as well as to other elements having gaseous derivatives and β-particle energies in excess of 0.5 Mev.
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