Table 11233 Classification Of Isotopes According To Relative Radiotoxicity Per Unit

ACTIVITY (THE ISOTOPES IN EACH CLASS ARE LISTED IN ORDER OF INCREASING ATOMIC NUMBER)

CLASS 1 (very high toxicity)

Sr-90 + Y-90, *Pb-210 + Bi-210 (RaD + E), Po-210, At-211, Ra-226 + percent ^daughter products, Ac-227, *U-233, Pu-239, *Am-241, Cm-242.

CLASS 2 (high toxicity)

Ca-45, *Fe-59, Sr-89, Y-91, Ru-106 + *Rh-106, *I-131, *Ba-140 + La-140, Ce-144 + *Pr-144, Sm-151, *Eu-154; *Tm-170, *Th-234 + *Pa-234, *natural uranium.

CLASS 3 (moderate toxicity)

*Na-22, *Na-24, P-32, S-35, Cl-36, *K-42, *Sc-46, Sc-47, *Sc-48, *V-48, *Mn-52, *Mn-54, *Mn-56, Fe-55, *Co-58, *Co-60, Ni-59, *Cu-64, *Zn-65, *Ga-72, *As-74, *As-76, *Br-82, *Rb-86, *Zr-95 - *Nb-95, *Nb-95, *Mo-99, Tc-98, *Rh-105, Pd-103 -Rh-103, *Ag-105, Ag-11, Cd-109 - *Ag-109, *Sn-113, *Te-127, *Te-129, *I-132, Cs-137 - *Ba-137, *La-140, Pr-143, Pm-147, *Ho-166, *Lu-177, *Ta-182, *W-181, *Re-183, *Ir-190, *Ir-192, Pt-191, *Pt-193, *Au-198, *Au-199, Tl-200, Tl-202, Tl-204, *Pb-203.

CLASS 4 (slight toxicity)

*Gamma-emitters.

Source: International Atomic Energy Agency (IAEA), Safe handling of radionuclides, Safety Series No. 1 (Vienna, Austria: IAEA).

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