Atom density Isotope atom/barn·cm C-14 1.8462E-09 O-16 4.7923E-02 Cl-36 1.0000E-06 Ca-41 1.0000E-06 Ni-59 1.0000E-06 Se-79 5.0582E-07 Zr-93 6.3637E-05 Rb-93 1.6072E-12 Sr-90 4.8584E-05 Sr-93 2.3719E-10 Y-93 1.9886E-08 Y-95 3.8958E-10 Nb-93m 6.6305E-11 Nb-94 6.2143E-11 Nb-95 1.9348E-06 Mo-93 1.1478E-14 Mo-95 6.0803E-05 Mo-99 1.7898E-07 Mo-101 6.2291E-10 Tc-99m 1.4716E-08 Tc-99 6.6733E-05 Tc-101 6.0649E-10 Ru-101 6.5615E-05 Ru-103 2.3665E-06 Rh-103 3.4702E-05 Pd-107 1.8503E-05 Pd-109 8.5605E-09 Ag-109 6.0729E-06 Sn-126 1.2852E-06 Sb-126 2.3835E-10 Sb-126m 3.1762E-13 Sb-129 1.9663E-09 Te-129m 6.4572E-08 I-129 1.0251E-05 I-133 6.1772E-08 I-135 1.8776E-08 Xe-133 3.7597E-07 Xe-135 1.0156E-08 Cs-133 6.9874E-05 Cs-135 3.4626E-05 Cs-137 7.5114E-05 Pr-143 6.9646E-07 Pr-147 2.1435E-10 Pr-149 2.0197E-11 Nd-143 4.6567E-05 Nd-145 3.8049E-05 Nd-147 2.5090E-07 Nd-149 9.9358E-10 Pm-147 7.4886E-06 Pm-149 4.4831E-08 Pm-151 8.6483E-09 Sm-147 4.7086E-06 Sm-149 1.3806E-07 Sm-150 1.6254E-05 Sm-151 9.7106E-07 Sm-152 6.3220E-06 Sm-153 3.8127E-08 Sm-155 2.3852E-11 Eu-151 1.5639E-09 Eu-152 3.2421E-09 Eu-153 6.6248E-06 Eu-155 3.4461E-07 Gd-155 5.4622E-09 Pb-210 3.8862E-18 Rn-222 9.3947E-21 Ra-226 1.4422E-15 Ra-228 9.3958E-22 Ac-227 3.2593E-16 Th-226 1.9447E-22 Th-229 5.9651E-14 Th-230 5.5098E-11 Th-232 1.2690E-11 Th-231 4.8649E-14 Pa-231 1.8739E-11 U-230 1.8514E-19 U-232 2.3106E-11 U-233 8.7082E-11 U-234 4.5729E-06 U-235 2.4950E-04 U-236 1.5044E-04 U-237 2.7902E-07 U-238 2.1947E-02 U-239 1.2843E-08 U-240 1.3550E-20 Np-235 6.7582E-13 Np-236 1.2422E-11 Np-236m 2.8487E-13 Np-237 1.9889E-05 Np-238 4.8303E-08 Np-239 1.8489E-06 Np-240 5.2420E-11 Pu-236 3.5918E-11 Pu-237 2.0813E-11 Pu-238 9.3508E-06 Pu-239 1.8344E-04 Pu-240 7.2862E-05 Pu-241 4.7994E-05 Pu-242 1.9005E-05 Pu-243 4.6387E-09 Pu-244 6.7468E-10 Pu-245 3.2226E-14 Pu-246 2.2173E-16 Am-239 1.8587E-16 Am-240 8.0708E-14 Am-241 2.2311E-06 Am-242 3.8342E-09 Am-242m 5.2630E-08 Am-243 5.6091E-06 Cm-242 5.9799E-07 Cm-243 2.2037E-08 Cm-244 2.3542E-06 Cm-245 1.3952E-07 Cm-246 1.3896E-08