Radioactive Isotopes Decay Calculator

Online calculator that allows you to find out the radiation activity decay in most popular isotopes used in chemistry and medicine.
Note: The calculation of radioactivity in minerals is based on certain assumptions.

Radiation Activity Decay Calculation

Isotope (t)
Half-life (T_1/2)
Initial Activity (A₀)
Decay time (t)



Final Activity (A)

List of all isotopes. Select an isotope to calculate its radio activity decay. Actinium 227 Aluminum 26 Aluminum 29 Americium 241 Antimony 124 Arsenic 74 Astatine 211 Barium 128 Barium 133 Barium 140 Beryllium 7 Bismuth 207 Bismuth 210 Bromine 77 Bromine 82 Cadmium 109 Calcium 45 Carbon 11 Carbon 14 Cerium 141 Cerium 144 Cesium 134 Cesium 137 Chlorine 36 Chromium 51 Cobalt 57 Cobalt 58 Cobalt 60 Copper 61 Copper 62 Copper 64 Copper 67 Curium 244 Europium 152 Fluorine 18 Gadolinium 153 Gallium 67 Germanium 68 Gold 198 Hafnium 181 Hydrogen 3 Indium 111 Indium 113m Indium 114m Iodine 123 Iodine 125 Iodine 131 Iodine 132 Iridium 192 Iron 52 Iron 55 Iron 59 Krypton 85 Lanthanum 140 Lutetium 177 Lead 210 Manganese 52m Manganese 54 Manganese 56 Mercury 197 Mercury 203 Molybdenum 99 Neodymium 147 Neptunium 237 Nickel 63 Niobium 94 Niobium 95 Nitrogen 13 Oxygen 15 Phosphorus 32 Phosphorus 33 Polonium 208 Polonium 210 Potassium 38 Potassium 42 Promethium 147 Plutonium 238 Plutonium 239 Plutonium 240 Plutonium 242 Radium 226 Rubidium 82 Rubidium 86 Ruthenium 103 Ruthenium 106 Scandium 46 Selenium 75 Silver 110 Silver 111 Sodium 22 Sodium 24 Strontium 82 Strontium 85 Strontium 89 Strontium 90 Sulphur 35 Technetium 99m Technetium 99 Thallium 201 Thallium 204 Thorium 228 Thorium 229 Thorium 230 Thorium 232 Tin 113 Tin 119m Uranium 233 Uranium 234 Uranium 235 Uranium 236 Uranium 238 Vanadium 48 Xenon 133 Xenon 135 Yttrium 87 Yttrium 90 Zinc 62 Zinc 65

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Formula Used:

A = A₀ e^{-(0.693t / T_1/2)} Where, A - Final Activity in Radioactive Material A₀ - Initial Activity t - Radiation Decay Time T_1/2 - Isotope Half-life

Radioactive Isotopes Decay Calculator

Radiation Activity Decay Calculation

Formula Used:

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