Common Radionuclides
Atomic #  Element  Abbr Isotope Mass  # Half-Life Radiation Type Activity
(electrons)     (protons +
     neutrons)		     curies per
metric ton
of uranium
1 Hydrogen
(Tritium)		 H 3 12 years Beta 71
4 Beryllium Be 10 2,700,000 years Beta  -
6 Carbon C 14 5,770 years Beta  -
20 Calcium Ca 41 100,000 years Positron  -
26 Iron Fe 59 45 days Beta  -
27 Cobalt Co 60 5 years Beta, Gamma  -
28 Nickel Ni 59 80,000 years Positron  -
30 Zinc Zn 65 145 days Beta, Gamma  -
34 Selenium  Se 79 70,000 years Beta 0.398
36 Krypton Kr 85 10 years Beta, Gamma 11,300
36 Krypton Kr 90 33 seconds Beta, Gamma  -
37 Rubidium Rb 87 47,000,000,000yr Beta  -
38 Strontium Sr 89 53 days Beta 718,000
38 Strontium Sr 90 28 years Beta 77,600
39 Yttrium Y 90 64 hours Beta, Gamma 80,700
39 Yttrium Y 91 58 days Beta 938,000
40 Zirconium Zr 93 950,000 yrs Beta 1.89
40 Zirconium Zr 95 65 days Beta 1,370,000
41 Niobium Nb 93m 4 years Gamma 0.145
41 Niobium Nb 95 35 days Beta, Gamma 1,380,000
42 Molybdenum Mo 93 10,000 years Positron  -
43 Technetium Tc 99 210,000 yrs Beta, Gamma 14.3
44 Ruthenium Ru 103 40 days Beta 1,220,000
44 Ruthenium Ru 106 1 year Beta 545,000
46 Palladium Pd 107 7,000,000 yrs Beta, Gamma 0.11
47 Silver Ag 110m 249 days Beta, Gamma 3,680
50 Tin Sn 126 100,000 years Beta 0.546
51 Antimony Sb 125 2 years Beta 8,700
52 Tellurium Te 127m 105 days Gamma, Beta 15,400
52 Tellurium Te 129 67 min. Beta 337,000
53 Iodine I 129 17,200,000yr Beta, Gamma 0.037
53 Iodine I 131 8 days Beta, Gamma 861,000
53 Iodine I 134 52 min. Beta, Gamma  -
54 Xenon Xe 133 5 days Beta, Gamma  
54 Xenon Xe 137 4 min. Beta, Gamma  
54 Xenon Xe 138 14 min. Beta, Gamma  -
55 Cesium Cs 134 2 years Beta, Gamma 246,000
55 Cesium Cs 135 2,000,000 yrs Beta, Gamma 0.286
55 Cesium Cs 137 30 years Beta, Gamma 108,000
58 Cerium Ce 144 285 days Beta 1,110,000
61 Promethium Pm 147 2 years Beta, Gamma 102,000
63 Europium Eu 154 16 years Beta,Positron,Gamma 6,990
63 Europium Eu 155 2 years Beta 7,480
82 Lead Pb 210 21 years Beta, Alpha  -
83 Bismuth Bi 210m 3,000,000 yrs Alpha  -
84 Polonium Po 210 138 days Alpha  -
86 Radon Rn 220 1 min. Alpha, Positron 0.002
86 Radon Rn 222 4 days Alpha  -
88 Radium Ra 224 4 days Alpha 0.002
88 Radium Ra 225 15 days Beta  -
88 Radium Ra 226 1,622 years Alpha  -
90 Thorium Th 228 2 years Alpha 0.002
90 Thorium Th 229 7,340 years Alpha  -
90 Thorium Th 230 80,000 years Alpha  -
90 Thorium Th 232 14 years Alpha  -
90 Thorium Th 234 24 days Beta 0.314
91 Proactinium Pa 226 2 min. Alpha, Positron  -
92 Uranium U 233 162,000 yrs Alpha  -
92 Uranium U 234 248,000 yrs Alpha 0.751
92 Uranium U 235 713,000,000 yrs Alpha 0.017
92 Uranium U 236 23,900,000 yrs Alpha 0.288
92 Uranium U 238 4,510,000,000 yrs Alpha 0.314
93 Neptunium Np 237 2,200,000 yrs Alpha 0.333
94 Plutonium Pu 236 285 years Alpha 0.350
94 Plutonium Pu 238 86 years Alpha 2.720
94 Plutonium Pu 239 24,390 years Alpha 318
94 Plutonium Pu 240 6,580 years Alpha 477
94 Plutonium Pu 241 13 years Beta, Alpha 105,000
94 Plutonium Pu 242 379,000 yrs Alpha 1.38
94 Plutonium Pu 243 5 years Alpha  -
94 Plutonium Pu 244 76,000,000 yrs Alpha  -
95 Americium Am 241 458 years Alpha 85.9
95 Americium Am 242 16 hours Beta,Pos,Alp,Ga 63,400
95 Americium Am 243 7,950 years Alpha 18.1
96 Curium Cm 242 163 days Alpha 33.400
96 Curium Cm 243 35 years Alpha 3.71
96 Curium Cm 244 18 years Alpha 2.440
96 Curium Cm 247 40,000,000 yrs Alpha  -

Well, there you have it, 78 highly radioactive poisons entering our
air, water, and ground everyday.

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