Abstract
The Canadian Certified Reference Materials Project reports recommended values of lead‐210 activity in four uranium reference materials previously certified for uranium and radium‐226. Eleven laboratories participated in the interlaboratory program for DL‐1a, BL‐4a, DH‐1a and BL‐5; three measurement techniques were applied. Procedural and instrumental calibrations were performed with a certified lead solution from Amersham International Corp., thereby establishing traceability of the recommended values for lead‐210. Activity ratios for uranium‐238. radium‐226 and lead‐210 demonstrate these uranium reference materials to be in secular equilibrium, within experimental uncertainties.
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