Radioactive Isotopes and Their Half-Lives - INI

[item.tellurium-128]
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

[item.xenon-136]
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

[item.thorium-232]
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

[item.uranium-238]
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

[item.potassium-40]
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

[item.uranium-235]
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

[item.plutonium-244]
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

[item.iodine-129]
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

[item.aluminum-26]
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

[item.carbon-14]
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

[item.plutonium-239]
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

[item.americium-241]
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

[item.radium-226]
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

[item.cesium-137]
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

[item.strontium-90]
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

[item.tritium]
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

[item.cobalt-60]
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

[item.iridium-192]
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

[item.iodine-131]
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

[item.molybdenum-99]
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

[item.technetium-99m]
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

[item.fluorine-18]
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

[item.radon-222]
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

[item.polonium-210]
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

[item.bismuth-213]
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

[item.actinium-225]
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

[item.lutetium-177]
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

[item.yttrium-90]
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

[item.phosphorus-32]
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

[item.sodium-24]
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

[item.gallium-68]
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

[item.copper-64]
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

[item.astatine-211]
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

[item.lead-212]
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

[item.thorium-229]
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

[item.protactinium-231]
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

[item.neptunium-237]
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

[item.curium-247]
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

[item.einsteinium-252]
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

[item.californium-251]
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