A laboratory uses a mass-type method (laser phosphorimetry) to determine uranium levels in the drinking water. In order to calculate the "net" alpha (gross alpha minus uranium and radon) used to determine compliance with the gross alpha MCL, the laborator
If uranium (U) is determined by mass-type methods (i.e., fluorometric or laser phosphorimetry), a 0.67 pCi/ug uranium conversion factor must be used (40 CFR 141.25 Footnote 12).
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