Radioisotopes Half-Lifes and Energies

99m Tc

Physical Half Life: 6.03 hours
Principle Energies: 140 keV
Notes: Isomeric Transition

131 I

Physical Half Life: 8.06 days
Principle Energies: 364 keV gamma used for imaging
Notes: Significant Beta emitter used in Rx

123 I

Physical Half Life: 13 hours
Principle Energies: 159 keV
Notes: EC decay

125 I

Physical Half Life: 60 days
Principle Energies: 27-30 keV
Notes: EC, gamma decay

99 Mo

Physical Half Life: 66 hours
Principle Energies: 740-780 keV
Notes: Moly breakthrough

111 In

Physical Half Life: 2.81 days
Principle Energies: 172 and 247 keV

18 F

Physical Half Life: 109 minutes
Principle Energies: 2(511) keV annihilation protons
Notes: PET imaging

67 Ga

Physical Half Life: 78.1 hours
Principle Energies: 93, 185, and 300 keV
Notes: EC decay

68 Ga

Physical Half Life: 67.7 minutes
Principle Energies: (2) 511 keV annihilation photons
Notes: PET imaging, generator produced from Ge/Ga generator

133 Xe

Physical Half Life: 5.3 days
Principle Energies: Several around 80 keV
Notes: Significant Beta emitter

201 TI

Physical Half Life: 73.1 hours
Principle Energies: Hg x-rays 69-80 keV, 135 keV gamma, 167 keV gamma
Notes: X-rays more abundant than gamma rays

57 Co

Physical Half Life: 270 days
Principle Energies: 122 keV
Notes: QC

137 Cs

Physical Half Life: 30 years
Principle Energies: 662 keV
Notes: QC

32 P

Physical Half Life: 14.3 days
Principle Energies: Average E = 695 keV
Notes: Pure Beta emitter

223 Ra

Physical Half Life: 11.4 days
Principle Energies: Average E = 5780 keV
Notes: Alpha emitter

177 Lu

Physical Half Life: 6.7 days
Principle Energies: Gamma rays at 113 and 210 keV useful for diagnosis and dosimetry
Notes: Significant beta emitter used in Rx

64 Cu

Physical Half Life: 12.7 hours
Principle Energies: Useful spectrum (2) 511 keV annihilation protons
Notes: PET imaging

225 Ac

Physical Half Life: 9.9 days

Principle Energies: Alpha decay, some gammas too

Notes: Actinium - therapeutic radiopharmaceutical