LIST OF THE HALF-LIVES OF COMMONLY ENCOUNTERED RADIONUCLIDES

Element	Isotopes w/ Half life
Actinium	Ac-225 - 10.0 days Ac-227 - 21.773 years Ac-228 - 6.13 hours
Americium	Am-241 - 432.2 years Am-242 - 16.02 hours Am-242m - 152 years Am-243 - 7380 years
Antimony	Sb-124 - 60.20 days Sb-125 - 2.77 years Sb-126 - 12.4 days Sb-126m - 19.0 minutes Sb-127 - 3.85 days
Argon	Ar-41 - 1.827 hours
Astatine	At-217 - 0.0323 seconds At-218 - 2 seconds
Barium	Ba-137m - 2.552 minutes Ba-139 - 82.7 minutes Ba-140 - 12.74 days Ba-141 - 18.27 minutes Ba-142 - 10.6 minutes
Beryllium	Be-10 - 1.6E6 years Be-7 - 53.44 days
Bismuth	Bi-210 - 5.012 days Bi-211 - 2.14 minutes Bi-212 - 60.55 minutes Bi-213 - 45.65 minutes Bi-214 - 19.9 minutes
Bromine	Br-82 - 35.30 hours Br-83 - 2.39 hours Br-84 - 31.80 minutes
Cadmium	Cd-113m - 13.6 years Cd-115m - 44.6 days
Calcium	Ca-41 - 1.3E5 years Ca-47 - 4.53 days
Californium	Cf-252 - 2.638 years
Carbon	C-11 - 20.38 minutes C-14 - 5730 years
Cerium	Ce-141 - 32.50 days Ce-143 - 33.0 hours Ce-144 - 284.3 days
Cesium	Cs-134 - 2.062 years Cs-134m - 2.90 hours Cs-135 - 2.3E6 years Cs-136 - 13.1 days Cs-137 - 30.0 years Cs-138 - 32.2 minutes
Chromium	Cr-51 - 27.704 days
Cobalt	Co-56 - 78.76 days Co-57 - 270.9 days Co-58 - 70.8 days Co-60 - 5.27 years
Copper	Cu-61 - 3.408 hours Cu-64 - 12.701 hours
Curium	Cm-242 - 162.8 days Cm-243 - 28.5 years Cm-244 - 18.11 years Cm-245 - 8500 years Cm-246 - 4730 years Cm-247 - 1.56E7 years Cm-248 - 3.39E5 years
Europium	Eu-152 - 13.33 years Eu-154 - 8.8 years Eu-155 - 4.96 years Eu-156 - 15.19 days
Fluorine	F-18 - 109.74 minutes
Francium	Fr-221 - 4.8 minutes Fr-223 - 21.8 minutes
Gadolinium	Gd-152 - 1.08E14 years
Gallium	Ga-67 - 3.261 days
Gold	Au-198 - 2.696 days
Holmium	Ho-166m - 1.20E3 years
Hydrogen	H-3 - 12.35 years
Indium	In-111 - 2.83 days In-113 - 1.658 hours In-115 - 5.1E15 years
Iodine	I-123 - 13.2 hours I-125 - 60.14 days I-129 - 1.57E7 years I-130 - 12.36 hours I-131 - 8.04 days I-132 - 2.30 hours I-133 - 20.8 hours I-134 - 52.6 minutes I-135 - 6.61 hours
Iridium	Ir-192 - 74.02 days
Iron	Fe-55 - 2.7 years Fe-59 - 44.53 days
Krypton	Kr-83m - 1.83 hours Kr-85 - 10.72 years Kr-85m - 4.48 hours Kr-87 - 76.3 minutes Kr-88 - 2.84 minutes
Lanthanum	La-140 - 40.272 hours La-141 - 3.93 hours La-142 - 92.5 minutes
Lead	Pb-209 - 3.253 hours Pb-210 - 22.3 years Pb-211 - 36.1 minutes Pb-212 - 10.64 hours Pb-214 - 26.8 minutes Pb-214 - 26.8 minutes
Manganese	Mn-52 - 5.591 days Mn-52m - 21.1 minutes Mn-54 - 312.5 days Mn-56 - 2.579 hours Mn-57 - 36.08 hours
Mercury	Hg-197 - 64.1 hours Hg-203 - 46.60 days
Molybdenum	Mo-93 - 3.5E3 years Mo-99 - 66.0 hours
Neodymium	Nd-147 - 10.98 days
Neptunium	Np-237 - 2.14E6 years Np-238 - 2.117 days Np-239 - 2.355 days Np-240 - 65 minutes Np-240m - 7.4 minutes
Nickel	Ni-59 - 7.5E4 years Ni-63 - 96 years Ni-65 - 2.520 hours
Niobium	Nb-93m - 13.6 years Nb-95 - 35.15 days Nb-95m - 86.6 hours Nb-97 - 72.1 minutes Nb-97m - 60 seconds
Nitrogen	N-13 - 9.97 minutes N-16 - 7.13 seconds
Oxygen	O-15 - 122.24 seconds
Palladium	Pd-107 - 6.5E6 years Pd-109 0- 13.427 hours
Phosphorus	P-32 - 14.29 days
Plutonium	Pu-238 - 87.74 years Pu-239 - 24065 years Pu-240 - 6537 years Pu-241 - 14.4 years Pu-242 - 3.76E5 years Pu-243 - 4.956 hours Pu-244 - 8.26E7 years
Polonium	Po-210 - 138.38 days Po-211 - 0.516 seconds Po-212 - 0.305 microseconds Po-213 - 4.2 microseconds Po-214 - 164.3 microseconds Po-215 - 0.00178 seconds Po-216 - 0.15 seconds Po-218 - 3.05 minutes
Potassium	K-40 - 1.27E9 years K-42 - 12.36 hours K-43 - 22.6 hours
Praseodymium	Pr-143 - 13.56 days Pr-144 - 17.28 minutes Pr-144m - 7.2 minutes
Promethium	Pm-147 - 2.6234 years Pm-148 - 5.37 days Pm-148 - 41.3 days Pm-149 - 53.08 hours Pm-151 - 28.40 hours
Protactinium	Pa-231 - 3.28E4 years Pa-233 - 27.0 days Pa-234 - 6.70 hours Pa-234m - 1.17 minutes
Radium	Ra-223 - 11.434 days Ra-224 - 3.66 days Ra-225 - 14.8 days Ra-226 - 1600 years Ra-228 - 5.75 years
Radon	Rn-219 - 3.96 seconds Rn-220 - 55.6 seconds Rn-222 - 3.824 days
Rhenium	Re-187 - 5E10 years
Rhodium	Rh-103m - 56.12 minutes Rh-105 - 35.36 hours Rh-106 - 29.9 seconds
Rubidium	Rb-86 - 18.66 days Rb-87 - 4.7E10 years Rb-88 - 17.8 minutes Rb-89 - 15.2 minutes
Ruthenium	Ru-103 - 39.28 days Ru-105 - 4.44 hours Ru-106 - 368.2 days Ru-97 - 2.9 days
Samarium	Sm-147 - 1.06E11 years Sm-151 - 90 years Sm-153 - 46.7 hours
Scandium	Sc-44 - 3.927 hours Sc-46 - 83.83 days Sc-47 - 3.351 days Sc-48 - 43.7 hours
Selenium	Se-75 - 119.78 days Se-79 - 65000 years
Silver	Ag-110 - 24.6 seconds Ag-110m - 249.9 days Ag-111 - 7.45 days
Sodium	Na-22 - 2.602 years Na-24 - 15.00 hours
Strontium	Sr-85 - 64.84 days Sr-87m - 2.81 hours Sr-89 - 50.5 days Sr-90 - 29.12 years Sr-91 - 9.5 hours Sr-92 - 2.71 hours
Sulfur	S-35 - 87.44 days
Technetium	Tc-101 - 14.2 minutes Tc-99 - 2.13E5 years Tc-99m - 6.02 hours
Tellurium	Te-125m - 58 days Te-127 - 9.35 hours Te-127m - 109 days Te-129 - 69.6 minutes Te-129m - 33.6 days Te-131 - 25.0 minutes Te-131m - 30 hours Te-132 - 78.2 hours Te-133 - 12.45 minutes Te-133m - 55.4 minutes Te-134 - 41.8 minutes
Terbium	Tb-160 - 72.3 days
Thallium	Tl-201 - 73.06 hours Tl-207 - 4.77 minutes Tl-208 - 3.07 minutes Tl-209 - 2.20 minutes
Thorium	Th-227 - 18.718 days Th-228 - 1.913 years Th-229 - 7340 years Th-230 - 7.7E4 years Th-231 - 25.52 hours Th-232 - 1.41E10 years Th-234 - 24.10 days
Tin	Sn-119m - 293.1 days Sn-123 - 129.2 days Sn-125 - 9.64 days Sn-126 - 1.0E5 years
Tungsten	W-181 - 121.2 days W-185 - 75.1 days W-187 - 23.9 hours
Uranium	U-232 - 72 years U-233 - 1.59E5 years U-234 - 2.445E5 years U-235 - 7.03E8 years U-236 - 2.34E7 years U-237 - 6.75 days U-238 - 4.47E9 years U-240 - 14.1 hours
Vanadium	V-48 - 16.238 days
Xenon	Xe-131m - 11.9 days Xe-133 - 5.245 days Xe-133m - 2.188 days Xe-135 - 9.09 hours Xe-135m - 15.29 minutes Xe-138 - 14.17 minutes
Ytterbium	Yb-169 - 32.01 days
Yttrium	Y-90 - 64.0 hours Y-91 - 58.51 days Y-91m - 49.71 minutes Y-92 - 3.54 hours Y-93 - 10.1 hours
Zinc	Zn-65 - 243.9 days Zn-69 - 57 minutes
Zirconium	Zr-93 - 1.53E6 years Zr-95 - 63.98 days Zr-97 - 16.90 hours