Potential alpha energy concentration
The concentration of short-lived radon or thoron progeny in air in terms of the alpha energy emitted during complete decay from radon-222 progeny to lead-210, or from radon-220 progeny to lead-208, of any mixture of short-lived radon-222 or radon-220 in a unit volume of air. The SI unit for potential alpha energy concentration is J m-3.
ICRP Publication 115, 2010
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