893
edits
Changes
→Units of Measure
Historically, PAEC was measured in units of Working Levels (WL).
1 WL= 2.08 x 10<sup>-5</sup>J m<sup>-3</sup>
====Quotes from ICRP====
[[ICRP Publication 65|Publication 65]]<ref name="Pub065">[[ICRP Publication 65]] Protection Against Radon-222 at Home and at Work - Ann ICRP 23(2) 1993.</ref> paragraphs 15-22
''The potential alpha energy … of an atom in the decay chain of radon is the total alpha energy emitted during the decay of this atom to stable <sup>210</sup>Pb…. The potential alpha energy concentration…of any mixture of short-lived radon progeny in air is the sum of the potential alpha energy of these atoms present per unit volume of air.… This quantity is expressed in the SI unit J m<sup>-3</sup>….''
''The potential alpha energy concentration … can be also expressed in terms of the so-called equilibrium equivalent concentration of … radon. The equilibrium equivalent concentration, corresponding to a non-equilibrium mixture of radon progeny in air, is the activity concentration of radon in radioactive equilibrium with its short-lived progeny that has the same potential alpha energy concentration … as the actual non-equilibrium mixture. The SI unit of the equilibrium equivalent concentration is Bq m<sup>-3</sup>….''
''… exposure … to radon progeny is defined as the time integral of the potential alpha energy concentration in air… The unit … is J h m<sup>-3</sup> … [or] the historical unit Working Level Month (WLM) … 1 WLM = 3.54 mJ h m<sup>-3</sup>… ''
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