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Table 4.

Adapted from currently recommended List of Radionuclides and Grouping for Consequence assessment – NUREG/CR-7270.

Group Number (GROUP) Chemical Group (GRPNAM) Radionuclides (NUNAM)
1 Noble Gas Kr-85, Kr-85m, Kr-87, Kr-88, Xe-133, Xe-135, Xe-135m
(Xe)
2 Alkali Metals Rb-86, Rb-88, Cs-134, Cs-136, Cs-137
(Cs)
3 Alkali Earths Sr-89, Sr-90, Sr-91, Sr-92, Ba-137m, Ba-139, Ba-140
(Ba)
4 Halogens I-131, I-132, I-133, I-134, I-135
(I)
5 Chancogens Te-127, Te-127m, Te-129, Te-129m, Te-131, Te-131m, Te-132
(Te)
6 Platinoids Ru-102, Ru-105, Ru-106, Rh-103m, Rh-105, Rh-106
(Ru)
7 Early Transition
Elements Co-58, Co-60, Nb-95, Nb-97, Nb-97m, Mo-99, Tc-99m
(Mo)
8 Tetravalents Zr-95, Zr-97, Ce-141, Ce-143, Ce-144, Np-239, Pu-238,
(Ce) Pu-239, Pu-240, Pu-241
9 Trivalents Y-90, Y-91m, Y-92, Y-93, La-140, La-141, La-142, Pr-143,
(La) Pr-144, Pr-144m, Nd-147, Am-241, Cm-242, Cm-244
10 More volatiles Sb-127, Sb-129
(MELCOR main group metals
Class 11) (Cd)

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