TABLE 5: Beryllium Isotopic Ratio Standard Nuclides SRM Approx. Isotopic Reference Expanded Solution Chemical Solution


Number Bq·g-1 Ratio


Beryllium-10/ 4325 0.0002 3 x 10-11 Beryllium-9†


† This standard is not radioactive material for licensing or shipping purposes.


(mL) 50 Aug 1986 5.1 BeCl2 1 M HCl


Time Uncertainty Volume Form Composition Concentration (%)


Beryllium (mg·mL-1


) 5


TABLE 6: Radiocarbon Dating Contemporary Standard Radionuclide SRM Approx. Reference Expanded


Number Bq·g-1 Carbon-14† 4990C 0.08


Time Uncertainty (%)


1980 1.6 † This standard is not radioactive material for licensing or shipping purposes


a) This SRM replaces SRM 4990, which has been in use in radiocarbon-dating laboratories since 1958. The material is part of a 450 kg lot of oxalic acid that was prepared by fermentation of French beet molasses from the 1977 spring, summer, and fall harvests. The ratio of the massic activity of SRM 4990C to that of SRM 4990, and the mass spectrometric ratios of carbon-13 to carbon-12 in each, were measured by eleven international carbon-dating laboratories in an intercomparison organized by L.M. Cavallo and W.B. Mann. See Proceedings of the 11th International Radiocarbon Dating Conference, M. Stuiver and R. Kra, Editors, Radiocarbon25, No. 2 (1983).


TABLE 7: Environmental Natural Matrix Standards SRM Number 4350B River Sediment† 4351 Human Lung† 4352 Human Liver† Name


Mass (g)


85 45 45


Activity Certified


60Co, 137 226Ra, 238 Cs, 152 232Th, 234 Eu, 154


Pu, 239+240 U, 238


238Pu, 239+240 Eu, Pu, 241 238Pu/(239+240


U, 239+240 Pu)


Pu, 241 Am Pu, Am Activity Given 40K, 55


But Not Certified Fe, 90


232Th, 234 228Th, 230


Sr, 228 U, 235


Th, 230 U,238


U Th, 241


228Th, 230 234U, 235


Am


Th, 232 U, 238


Th, U 98 c c Th,


Other Data


a, b, c


Mass (g)


225 (8 x 28)


Chemical Physical Notes Form


Form


Oxalic Acid


Crystalline Powder


a


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