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Commonly Used Isotope Information

Carbon-14 (14C)
  • Radioactive Half-life: 5730 years
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 0.156 MeV (156 keV) maximum energy
  • Radiation Detection: Thin window GM, LSC (LS) counting
  • Radiation Hazard: Normally no external radiation hazard
  • Shielding: Not necessary, normal laboratory safety precaution
Sodium-22 (22Na)
  • Radioactive Half-life: 2.62 years
  • Decay Mechanism: Positron
  • Major Radiation: gamma
  • Energy: 1.275, 0.511 MeV
  • Radiation Detection: GM, ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material
Phosphous-32 (32P)
  • Radioactive Half-life: 14.3 days
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 1.709 MeV maximum energy
  • Radiation Detection: Thin window GM, LS counting
  • Radiation Hazard: Beta (possible x-ray radiation)
  • Shielding: 1 cm Lucite
Phosphous-33 (33P)
  • Radioactive Half-life: 25 days
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 0.248 MeV (248 keV) maximum energy
  • Radiation Retection: Thin window GM, LSC
  • Radiation Hazard: Normally no external radiation hazard
  • Shielding: Not necessary, normal laboratory safety precaution
Sulfur-35 (35S)
  • Radioactive Half-life: 87.9 days
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 0.167 MeV (167 keV) maximum energy
  • Radiation Detection: Thin window GM, LSC
  • Radiation Hazard: Normally no external radiation hazard
  • Shielding: Not necessary, normal lab. safety precaution
Calcium-45 (45Ca)
  • Radioactive Half-life: 165 days
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 0.252 MeV (252 keV) maximum energy
  • Radiation Detection: Thin window GM, LSC
  • Radiation Hazard: Little external radiation hazard
  • Shielding: Not necessary, normal lab. safety precaution
Scandium-46 (46Sc)
  • Radioactive Half-life: 83.9 days
  • Decay Mechanism: Beta
  • Major Radiation: Gamma
  • Energy: 1.120 and 0.889 MeV
  • Radiation Detection: GM, Ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material
Chromium-51 (51Cr)
  • Radioactive Half-life: 27.8 days
  • Decay Mechanism: Electron capture
  • Major Radiation: Gamma
  • Energy: 0.320 MeV (320 keV)
  • Radiation Detection: GM, ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material
Iron-59 (59Fe)
  • Radioactive Half-life: 45.6 days
  • Decay Mechanism: Beta
  • Major Radiation: Gamma
  • Energy: 1.292, 1.095 MeV
  • Radiation Detection GM, ion chamber
  • Radiation Hazard External radiation hazard
  • Shielding: Lead, high density material
Nickel-63 (63Ni)
  • Radioactive Half-life: 100 years
  • Decay Mechanism: Beta
  • Major Radiation: Beta
  • Energy: 0.067 MeV (67 keV) maximum energy
  • Radiation Detection: Liquid scintillation counting
  • Radiation Hazard: No external radiation hazard
  • Shielding: Not necessary, normal lab. safety precaution
Selenium-75 (75Se)
  • Radioactive Half-life: 120 days
  • Decay Mechanism: Electron capture
  • Major Radiation: Gamma
  • Energy: 0.401, 0.280, 0.265, 0.136, 0.121 MeV
  • Radiation Detection: GM, Ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material
Iodine-125 (125I)
  • Radioactive Half-life: 60 days
  • Decay Mechanism: Electron capture
  • Major Radiation: Gamma
  • Energy: 0.035, 0.031, 0.027 MeV (35, 31, and 27 keV)
  • Radiation Detection: GM, Ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material
Iodine-131 (131I)
  • Radioactive Half-life: 8.1 days
  • Decay Mechanism: Beta
  • Major Radiation: Gamma
  • Energy: 0.364, 0.284, 0.030 MeV (364, 284, 30 keV)
  • Radiation Detection: GM, Ion chamber
  • Radiation Hazard: External radiation hazard
  • Shielding: Lead, high density material

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