Radioactive Isotopes and Their Half-Lives - TOML

[[items]]
code = "001"
slug = "tellurium-128"
name = "Tellurium-128"
description = "The radioactive isotope with the longest known half-life."
atomicNumber = 52
category = "naturally-occurring"
decayMode = "double beta decay"
halfLife_seconds = 6.94e+31
halfLife_unit = "×10²⁴ years"
halfLife_value = 2.2
massNumber = 128
symbol = "Te-128"

[[items]]
code = "002"
slug = "xenon-136"
name = "Xenon-136"
description = "A noble gas isotope that undergoes double beta decay."
atomicNumber = 54
category = "naturally-occurring"
decayMode = "double beta decay"
halfLife_seconds = 7.51e+28
halfLife_unit = "×10²¹ years"
halfLife_value = 2.38
massNumber = 136
symbol = "Xe-136"

[[items]]
code = "003"
slug = "thorium-232"
name = "Thorium-232"
description = "The parent nuclide of the thorium series, abundantly present on Earth."
atomicNumber = 90
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 445000000000000000
halfLife_unit = "×10¹⁰ years"
halfLife_value = 1.41
massNumber = 232
symbol = "Th-232"

[[items]]
code = "004"
slug = "uranium-238"
name = "Uranium-238"
description = "The main component of natural uranium and parent nuclide of the uranium series."
atomicNumber = 92
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 141000000000000000
halfLife_unit = "×10⁹ years"
halfLife_value = 4.47
massNumber = 238
symbol = "U-238"

[[items]]
code = "005"
slug = "potassium-40"
name = "Potassium-40"
description = "A radioactive isotope of potassium widely used for rock dating."
atomicNumber = 19
category = "naturally-occurring"
decayMode = "beta decay / electron capture"
halfLife_seconds = 39800000000000000
halfLife_unit = "×10⁹ years"
halfLife_value = 1.26
massNumber = 40
symbol = "K-40"

[[items]]
code = "006"
slug = "uranium-235"
name = "Uranium-235"
description = "Fissile material and the primary fuel for nuclear power generation."
atomicNumber = 92
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 22200000000000000
halfLife_unit = "×10⁸ years"
halfLife_value = 7.04
massNumber = 235
symbol = "U-235"

[[items]]
code = "007"
slug = "plutonium-244"
name = "Plutonium-244"
description = "The plutonium isotope with the longest half-life."
atomicNumber = 94
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 2610000000000000
halfLife_unit = "×10⁷ years"
halfLife_value = 8.26
massNumber = 244
symbol = "Pu-244"

[[items]]
code = "008"
slug = "iodine-129"
name = "Iodine-129"
description = "A long-lived fission product used for geological dating."
atomicNumber = 53
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 495000000000000
halfLife_unit = "×10⁷ years"
halfLife_value = 1.57
massNumber = 129
symbol = "I-129"

[[items]]
code = "009"
slug = "aluminum-26"
name = "Aluminum-26"
description = "Produced by cosmic rays and used for meteorite dating."
atomicNumber = 13
category = "cosmogenic"
decayMode = "beta decay / electron capture"
halfLife_seconds = 22600000000000
halfLife_unit = "×10⁵ years"
halfLife_value = 7.17
massNumber = 26
symbol = "Al-26"

[[items]]
code = "010"
slug = "carbon-14"
name = "Carbon-14"
description = "The most famous isotope that forms the basis of radiocarbon dating."
atomicNumber = 6
category = "cosmogenic"
decayMode = "beta decay"
halfLife_seconds = 181000000000
halfLife_unit = "years"
halfLife_value = 5730
massNumber = 14
symbol = "C-14"

[[items]]
code = "011"
slug = "plutonium-239"
name = "Plutonium-239"
description = "Fissile material used in both nuclear power and weapons."
atomicNumber = 94
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 761000000000
halfLife_unit = "years"
halfLife_value = 24100
massNumber = 239
symbol = "Pu-239"

[[items]]
code = "012"
slug = "americium-241"
name = "Americium-241"
description = "An artificial radioactive element widely used in smoke detectors."
atomicNumber = 95
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 13600000000
halfLife_unit = "years"
halfLife_value = 432.2
massNumber = 241
symbol = "Am-241"

[[items]]
code = "013"
slug = "radium-226"
name = "Radium-226"
description = "A famous radioactive element discovered by Marie Curie, once used in medicine."
atomicNumber = 88
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 50500000000
halfLife_unit = "years"
halfLife_value = 1600
massNumber = 226
symbol = "Ra-226"

[[items]]
code = "014"
slug = "cesium-137"
name = "Cesium-137"
description = "A fission product used in medicine and industry, but also a concern for environmental contamination."
atomicNumber = 55
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 952000000
halfLife_unit = "years"
halfLife_value = 30.17
massNumber = 137
symbol = "Cs-137"

[[items]]
code = "015"
slug = "strontium-90"
name = "Strontium-90"
description = "A fission product that easily accumulates in bones, important for environmental monitoring."
atomicNumber = 38
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 909000000
halfLife_unit = "years"
halfLife_value = 28.8
massNumber = 90
symbol = "Sr-90"

[[items]]
code = "016"
slug = "tritium"
name = "Tritium"
description = "A radioactive isotope of hydrogen used in fusion research and luminous watch dials."
atomicNumber = 1
category = "cosmogenic"
decayMode = "beta decay"
halfLife_seconds = 388000000
halfLife_unit = "years"
halfLife_value = 12.3
massNumber = 3
symbol = "H-3"

[[items]]
code = "017"
slug = "cobalt-60"
name = "Cobalt-60"
description = "An artificial radioactive isotope widely used as a radiation source for cancer treatment."
atomicNumber = 27
category = "artificial"
decayMode = "beta decay"
halfLife_seconds = 166000000
halfLife_unit = "years"
halfLife_value = 5.27
massNumber = 60
symbol = "Co-60"

[[items]]
code = "018"
slug = "iridium-192"
name = "Iridium-192"
description = "A gamma source widely used for industrial radiographic testing."
atomicNumber = 77
category = "artificial"
decayMode = "beta decay"
halfLife_seconds = 6380000
halfLife_unit = "days"
halfLife_value = 73.8
massNumber = 192
symbol = "Ir-192"

[[items]]
code = "019"
slug = "iodine-131"
name = "Iodine-131"
description = "A nuclear medicine radioisotope used for thyroid diagnosis and treatment."
atomicNumber = 53
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 695000
halfLife_unit = "days"
halfLife_value = 8.04
massNumber = 131
symbol = "I-131"

[[items]]
code = "020"
slug = "molybdenum-99"
name = "Molybdenum-99"
description = "The parent nuclide of Technetium-99m, forming the foundation of nuclear medicine diagnostics."
atomicNumber = 42
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 237000
halfLife_unit = "hours"
halfLife_value = 65.9
massNumber = 99
symbol = "Mo-99"

[[items]]
code = "021"
slug = "technetium-99m"
name = "Technetium-99m"
description = "The most widely used radioisotope in nuclear medicine diagnostics."
atomicNumber = 43
category = "artificial"
decayMode = "isomeric transition"
halfLife_seconds = 21600
halfLife_unit = "hours"
halfLife_value = 6.01
massNumber = 99
symbol = "Tc-99m"

[[items]]
code = "022"
slug = "fluorine-18"
name = "Fluorine-18"
description = "A positron-emitting nuclide used in PET scans."
atomicNumber = 9
category = "artificial"
decayMode = "positron emission"
halfLife_seconds = 6588
halfLife_unit = "minutes"
halfLife_value = 109.8
massNumber = 18
symbol = "F-18"

[[items]]
code = "023"
slug = "radon-222"
name = "Radon-222"
description = "A naturally occurring radioactive gas that causes indoor air pollution."
atomicNumber = 86
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 330000
halfLife_unit = "days"
halfLife_value = 3.82
massNumber = 222
symbol = "Rn-222"

[[items]]
code = "024"
slug = "polonium-210"
name = "Polonium-210"
description = "Emits strong alpha radiation and was once used in static eliminators."
atomicNumber = 84
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 12000000
halfLife_unit = "days"
halfLife_value = 138.4
massNumber = 210
symbol = "Po-210"

[[items]]
code = "025"
slug = "bismuth-213"
name = "Bismuth-213"
description = "An alpha source used in targeted alpha therapy for cancer treatment."
atomicNumber = 83
category = "artificial"
decayMode = "beta decay / alpha decay"
halfLife_seconds = 2736
halfLife_unit = "minutes"
halfLife_value = 45.6
massNumber = 213
symbol = "Bi-213"

[[items]]
code = "026"
slug = "actinium-225"
name = "Actinium-225"
description = "A promising radioisotope used in targeted alpha therapy."
atomicNumber = 89
category = "artificial"
decayMode = "alpha decay"
halfLife_seconds = 855000
halfLife_unit = "days"
halfLife_value = 9.9
massNumber = 225
symbol = "Ac-225"

[[items]]
code = "027"
slug = "lutetium-177"
name = "Lutetium-177"
description = "A beta source used for treating neuroendocrine tumors."
atomicNumber = 71
category = "artificial"
decayMode = "beta decay"
halfLife_seconds = 575000
halfLife_unit = "days"
halfLife_value = 6.65
massNumber = 177
symbol = "Lu-177"

[[items]]
code = "028"
slug = "yttrium-90"
name = "Yttrium-90"
description = "A beta source used for liver cancer treatment (SIRT)."
atomicNumber = 39
category = "fission-product"
decayMode = "beta decay"
halfLife_seconds = 231000
halfLife_unit = "hours"
halfLife_value = 64.1
massNumber = 90
symbol = "Y-90"

[[items]]
code = "029"
slug = "phosphorus-32"
name = "Phosphorus-32"
description = "Used for malignant tumor treatment and biological research."
atomicNumber = 15
category = "artificial"
decayMode = "beta decay"
halfLife_seconds = 1240000
halfLife_unit = "days"
halfLife_value = 14.3
massNumber = 32
symbol = "P-32"

[[items]]
code = "030"
slug = "sodium-24"
name = "Sodium-24"
description = "Used for blood flow measurement and industrial flow measurement."
atomicNumber = 11
category = "artificial"
decayMode = "beta decay"
halfLife_seconds = 54000
halfLife_unit = "hours"
halfLife_value = 15
massNumber = 24
symbol = "Na-24"

[[items]]
code = "031"
slug = "gallium-68"
name = "Gallium-68"
description = "A positron-emitting nuclide used in PET scans."
atomicNumber = 31
category = "artificial"
decayMode = "positron emission"
halfLife_seconds = 4080
halfLife_unit = "minutes"
halfLife_value = 68
massNumber = 68
symbol = "Ga-68"

[[items]]
code = "032"
slug = "copper-64"
name = "Copper-64"
description = "A versatile nuclide used for both PET imaging and radionuclide therapy."
atomicNumber = 29
category = "artificial"
decayMode = "beta decay / positron emission / electron capture"
halfLife_seconds = 45720
halfLife_unit = "hours"
halfLife_value = 12.7
massNumber = 64
symbol = "Cu-64"

[[items]]
code = "033"
slug = "astatine-211"
name = "Astatine-211"
description = "A rare halogen element used in targeted alpha therapy."
atomicNumber = 85
category = "artificial"
decayMode = "alpha decay / electron capture"
halfLife_seconds = 25920
halfLife_unit = "hours"
halfLife_value = 7.2
massNumber = 211
symbol = "At-211"

[[items]]
code = "034"
slug = "lead-212"
name = "Lead-212"
description = "An intermediate nuclide of the thorium series used in targeted radionuclide therapy."
atomicNumber = 82
category = "naturally-occurring"
decayMode = "beta decay"
halfLife_seconds = 38160
halfLife_unit = "hours"
halfLife_value = 10.6
massNumber = 212
symbol = "Pb-212"

[[items]]
code = "035"
slug = "thorium-229"
name = "Thorium-229"
description = "A thorium isotope used in nuclear clock research."
atomicNumber = 90
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 232000000000
halfLife_unit = "years"
halfLife_value = 7340
massNumber = 229
symbol = "Th-229"

[[items]]
code = "036"
slug = "protactinium-231"
name = "Protactinium-231"
description = "A long-lived radionuclide used for dating ocean circulation."
atomicNumber = 91
category = "naturally-occurring"
decayMode = "alpha decay"
halfLife_seconds = 1030000000000
halfLife_unit = "years"
halfLife_value = 32760
massNumber = 231
symbol = "Pa-231"

[[items]]
code = "037"
slug = "neptunium-237"
name = "Neptunium-237"
description = "The parent nuclide of the neptunium series, present in spent nuclear fuel."
atomicNumber = 93
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 67500000000000
halfLife_unit = "×10⁶ years"
halfLife_value = 2.14
massNumber = 237
symbol = "Np-237"

[[items]]
code = "038"
slug = "curium-247"
name = "Curium-247"
description = "The curium isotope with the longest half-life."
atomicNumber = 96
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 492000000000000
halfLife_unit = "×10⁷ years"
halfLife_value = 1.56
massNumber = 247
symbol = "Cm-247"

[[items]]
code = "039"
slug = "einsteinium-252"
name = "Einsteinium-252"
description = "The einsteinium isotope with the longest half-life."
atomicNumber = 99
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 40800000
halfLife_unit = "days"
halfLife_value = 471.7
massNumber = 252
symbol = "Es-252"

[[items]]
code = "040"
slug = "californium-251"
name = "Californium-251"
description = "The californium isotope with the longest half-life."
atomicNumber = 98
category = "transuranic"
decayMode = "alpha decay"
halfLife_seconds = 28300000000
halfLife_unit = "years"
halfLife_value = 898
massNumber = 251
symbol = "Cf-251"