Half-lives and Energies

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Last updated 10:42 PM on 7/14/26
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56 Terms

1
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Tc-99m half-life

6.02 hours

2
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Tc-99m emission

Single gamma photon (140 keV)

3
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Mo-99 half-life

66 hours

4
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Mo-99 emission

Beta decay + gamma emissions (740 keV, 778 keV)

5
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I-131 half-life

8 days

6
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I-131 emission

Beta minus + gamma (364 keV)

7
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I-123 half-life

13 hours

8
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I-123 emission

Gamma emission (159 keV)

9
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In-111 half-life

2.8 days

10
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In-111 emission

Gamma emission (171 keV, 245 keV)

11
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Xe-133 half-life

5.24 days

12
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Xe-133 emission

Beta minus + gamma (81 keV)

13
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Tl-201 half-life

3.04 days

14
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Tl-201 emission

Electron capture + gamma/X-ray emissions (69 keV, 135 keV, 167 keV)

15
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Ga-67 half-life

3.26 days

16
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Ga-67 emission

Electron capture + gamma emissions (93 keV, 185 keV, 300 keV, 394 keV)

17
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Cs-137 half-life

30 years

18
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Cs-137 emission

Beta minus + gamma (662 keV)

19
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Ge-68 half-life

271 days

20
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Ge-68 emission

Electron capture (decays to Ga-68)

21
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Ge-68 gamma energy

511 keV annihilation photons from Ga-68 daughter

22
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Ga-68 half-life

68 minutes

23
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Ga-68 emission

Positron emission (β+) + annihilation photons (511 keV)

24
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Sr-82 half-life

25 days

25
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Sr-82 emission

Electron capture (decays to Rb-82)

26
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Rb-82 half-life

76 seconds

27
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Rb-82 emission

Positron emission (β+) + annihilation photons (511 keV)

28
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Co-57 half-life

272 days

29
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Co-57 emission

Electron capture + gamma emissions (122 keV, 136 keV)

30
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F-18 half-life

109.8 minutes

31
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F-18 emission

Positron emission (β+) + annihilation photons (511 keV)

32
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C-11 half-life

20.4 minutes

33
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C-11 emission

Positron emission (β+) + annihilation photons (511 keV)

34
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N-13 half-life

9.97 minutes

35
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N-13 emission

Positron emission (β+) + annihilation photons (511 keV)

36
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O-15 half-life

2 minutes

37
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O-15 emission

Positron emission (β+) + annihilation photons (511 keV)

38
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Cu-64 half-life

12.7 hours

39
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Cu-64 emission

β+ and β− decay + electron capture

40
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Lu-177 half-life

6.7 days

41
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Lu-177 emission

Beta minus + gamma (208 keV, 113 keV)

42
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Y-90 half-life

64 hours

43
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Y-90 emission

Pure beta minus (no significant gamma)

44
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Sr-89 half-life

50.5 days

45
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Sr-89 emission

Pure beta minus

46
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Ra-223 half-life

11.4 days

47
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Ra-223 emission

Alpha decay

48
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I-125 half-life

59.4 days

49
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I-125 emission

Electron capture + gamma/X-ray (35 keV)

50
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Sm-153 half-life

46.3 hours

51
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Sm-153 emission

Beta minus + gamma (103 keV)

52
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P-32 half-life

14.3 days

53
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P-32 emission

Pure beta minus

54
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Cr-51 half-life

27.7 days

55
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Cr-51 emission

Electron capture + gamma (320 keV)

56
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PET emission energy

511 keV