Common Isotopes

Isotope

Ci/g

Ci/L to ppm
multiply by:

ppm to Ci/L
multiply by:

Ac-227 72.9 1.37E+01 7.29E-02
Ac-228 2.24E+06 4.46E-04 2.24E+03
Am-241 3.24E+00 3.09E+02 3.24E-03
Am-242m 9.72E+00 1.03E+02 9.72E-03
Am-242 8.09E+05 1.24E-03 8.09E+02
Am-243 1.85E-01 5.41E+03 1.85E-04
Am-244 1.27E+06 7.87E-04 1.27E+03
Ba-131 8.31E+04 1.20E-02 8.31E+01
Ba-140 7.29E+04> 1.37E-02 7.29E+01
Cd-109 2.64E+03 3.79E-01 2.64E+00
Cd-115m 2.60E+04 3.85E-02 2.60E+01
Cd-115 5.09E+05 1.96E-03 5.09E+02
Cf-249 4.089 -- --
Cm-248 0.0043 -- --
Cs-137 87 1.15E+01 8.70E-02
Cs-138 4.20E+07 2.38E-05 4.20E+04
Co-157 8480 1.18E-01 8.48E+00
Co-60 1133 8.83E-01 1.13E+00
Mo-99 4.75E+05 2.11E-03 4.75E+02
Np-237 7.05E-04 1.42E+06 7.05E-07
Np-239 2.33E+05 4.29E-03 2.33E+02
Pu-238 17.4 5.75E+01 1.74E-02
Pu-239 0.0614 1.63E+04 6.14E-05
Pu-240 0.226 4.42E+03 2.26E-04
Pu-241 112 8.93E+00 1.12E-01
Pu-242 3.90E-03 2.56E+05 3.90E-06
Pu-243 2.59E+06 3.86E-04 2.59E+03
Pu-244 1.90E-05 5.26E+07 1.90E-08
Sr-89 2.78E+04 3.60E-02 2.78E+01
Sr-90 143 6.99E+0 1.4E-01
Tc-99 1.69E-2 -- 6.28E+8
Th-232 1.10E-07 -- --
U-235 2.10E-06 4.76E+08 2.10E-09
U-238 3.33E-07 3.00E+09 3.33E-10

Last Updated: 2/23/01