Isotope Half life Photopeak(s) Uses
technetium 99m 6 hours 140 keV (98%) Most common imaging radionuclide
cobalt 57 271 days 122 & 136 keV gamma flood source
gallium 67 78.3 hours 93 (40%), 184 (24%), 296 (22%), 388 (7%) keV gamma inflammation/infection
carbon 11 20.3 minutes 960 & 320 keV positron PET general
oxygen 15 124 seconds 1732, 696 keV positron PET general
nitrogen 13 10 minutes 1198 & 432 keV positron PET cardiac
flourine 18 110 minutes 634 & 202 keV positron PET general
molybdenum 99 67 hours 181, 740 & 780 keV gamma Production of Tc
iodine 123 13.2 hours 28 keV (92%) & 159 keV (84%) gamma Thyroid imaging
iodine 131 8 days 364 keV (82%) gamma & 190 keV (90%) beta Thyroid imaging and therapy
thallium 201 73.1 hours 69, 81 keV X-rays (from Hg 201 production) Tumor imaging, cardiac imaging
krypton 81m 13 seconds 176 keV & 191 keV gamma ventilation scan
xenon 133 5.3 days 81 keV gamma &  374 keV beta ventilation scan
indium 111 67 hours 173 (89%) & 247 (94%) keV gamma WBC scan, octreotide scan
rubidium 82 75 seconds 3356 & 1385 keV positron PET cardiac
gallium 68 67.7 minutes 1.9 MeV positron PET general
polonium 218 3.1 min alpha and beta Daughter of radon
lead 206 Stable None End of many decay chains
radium 226 & 228 1600 y & 7 y 4800 keV alpha and 4600 keV beta resp. Historic,  watch dials
thorium 232 1.4 e 11 y 4.083 MeV alpha Historic, contrast agent
radon 222 3.8 d 5590 keV alpha Most common natural exposure
phosphorus 32 14.3 days 1.71 MeV, 0.7 MeV beta, 910 keV gamma malignant effusion therapy
samarium 153 46 hours 0.81 MeV, 0.23 MeV beta, 103 keV (30%) gamma bone pain therapy
strontium 89 50.5 days 1.46 MeV, 0.58 beta bone pain therapy
iodine 125 59.4 days 28 &75%) 27(39%) 31 (20%) 35 (6%) gamma Renal imaging
carbon 14 5730 years 156 keV beta Urea breath test
yttrium 90 64 hours 2.2 and 0.93 MeV beta radioimmunotherapy NHL
plutonium 238 88 years 5.5 MeV alpha, fission Fission isotope production
uranium 235 7.04e8 years 4.7 MeV alpha, fission Fission isotope production
lead 201 9.33 hours gamma Production of Tl 201
iodine 127 Stable Stable Production of Xe 123
cobalt 60 5.27 years 2.82 MeV beta gamma knife radiotherapy
iridium 192 73.8 days 1.46 MeV beta, 1.05 MeV gamma brachytherapy
cobalt 57 271.8 days 836 keV gamma Schilling's Test
chromium 51 27.7 days 320 keV gamma Tagged RBC
cerium 142 5 e 16 years beta decay Doping agent in scintillation crystals
rubidium 81 4.6 hours 445 keV gamma and 511 keV positron Generation of Kr 81m
yttrium 87 3.4 days 480 keV, 380 keV gamma Generation of Sr 97m
potassium 38 7.71 mintues 2.68 MeV Positron PET
rubidium 82m 6.3 hours 0.78 MeV positron PET
strontium 83 32.4 hours 1.15 MeV positron PET
iodine 124 4.2 days complex (97 gammas 6 positron)  PET; Contaminant isotope with I 123
cesium 137 30.1 y 1.18 MeV beta, gamma Radiation therapy
gold 198 2.7 days 0.96 MeV, 0.31 MeV beta, 412 keV gamma Radiation therapy
lutetium 177 6.65 days 497 keV beta; 112, 249, & 321 keV gamma Radiation therapy
palladium 103 17 days 21 keV gamma Radiation therapy
rhenium 186 90 hours 0.34 MeV beta, 186 keV gamma Radiation therapy
selenium 75 120 days 264, 136, and 279 keV gamma Research
tritium 12.32 years 0.018 MeV beta Research
bismuth 213 45.6 minutes 8400 keV alpha Targeted alpha therapy
indium 113m 1.7 hours 392 keV gamma cisternography and cardiac
potassium 40 1.3 e 9 1500 keV gamma 1300 keV electron 1500 keV positron Largest internal natural source
rhenium 188 17 hours 155 keV gamma Radiation therapy
erbium 169 9.4 days 351 keV beta Arthritis palliation
ytterbium 169 32 days 909 keV gamma CSF analysis
magnesium 24 Stable 2.4 and 1.4 MeV gamma Decay of Na 24
boron 11 Stable Stable Decay product of C 11
oxygen 18 Stable Stable Decay product of F 18
tellurium 123 1e13 years 51 keV gamma Decay product of I 123
xenon 131 Stable Stable Decay product of I 131
carbon 13 Stable Stable Decay product of N 13
nitrogen 15 Stable Stable Decay product of O 15
mercury 201 Stable Stable Decay product of Tl 201
iron 59 44.5 days 1.6 MeV beta Evaluation of splenic iron metabolism
neon 20 Stable Stable Intermediate in F 18 production
potassium 42 12.4 hours 3535 keV beta Metabolic studies
sodium 24 15 hours 1400 keV beta Metabolic studies
antimony 118 3.5 min 2670 keV positron PET
bromine 76 16.1 h 3980 keV positron PET
cesium 128 3.8 m 2900 keV positron PET
cobalt 58 70.9 days 2.31 MeV positron PET
Indium 110 66 m 2250 keV positron PET
iron 52 8.2 horus 0.80 MeV positron PET
manganese 51 46.2 minutes 2.17 MeV positron PET
manganese 52 5.6 days 0.575 MeV positron PET
manganese 52m 21.1 min 1630 keV positron PET
scandium 44 3.92 h 1470 keV positron PET
titanium 45 3.09 h 1040 keV positron PET
zirconium 89 78.4 hours 900 keV positron PET
copper 60 23.4 min 3900 keV positron PET and copper metabolism
copper 61 3.32 hours 1220 keV positron PET and copper metabolism
copper 62 9.76 min 2910 keV positron PET and copper metabolism
copper 64 12.7 hours 579 keV positron,653 keV beta, & 1354 keV gamma PET and copper metabolism
Technetrium 94m 53 minutes 2.47 MeV positron PET; replace Tc99m SPECT
gallium 66 9.45 hours 4100 keV positron PET; therapy
yttrium 86 14.74 h 3.15 MeV positron Pretherapy uptake imaging
helium 3 Stable Stable Product in F 18 production
nitrogen 14 Stable Stable Production of C 11
germanium 68 275 days 9.2 and 10.3 keV X-rays Production of Ga 68
antimony 121 Stable Stable Production of I 123
tellurium 122 Stable Stable Production of I 123
tellurium 124 Stable Stable Production of I 123
xenon 123 2.08 hours electron capture Production of I 123
tin 113 115.09 days electron capture Production of In 113m
ytterbium 177 1.9 hours 1.4 MeV beta Production of lutetium
oxygen 16 Stable Stable Production of N 13
strontium 82 25.4 days beta decay Production of Rb 82
dysprosium 165 2.33 hours 1300 keV beta Synovectomy
americium 241 432.2 years 5638 keV alpha smoke detectors
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