TABLE 1.
   Recommended radionuclide half-lives


  Data uncertainties are defined as standard
  deviations corresponding to the 1σ confidence level.

  Nuclide
 

Half-life (days)
1 year = 365.2422 days

  11-Na-22

  950.57  ± 0.23

  11-Na-24

  0.62329  ± 0.00006

  19-K-40

  (4.563  ± 0.013) 10+11

  21-Sc-46

  83.79  ± 0.04

  24-Cr-51

  27.7009  ± 0.0020

  25-Mn-54

  312.29  ± 0.26

  25-Mn-56

  0.107449  ± 0.000019

  26-Fe-55

  1002.7  ± 2.3

  26-Fe-59

  44.494  ± 0.013

  27-Co-56

  77.236  ± 0.026

  27-Co-57

  271.80  ± 0.05

  27-Co-58

  70.86 ± 0.06

  27-Co-60

  1925.23  ± 0.27

  29-Cu-64

  0.52929  ± 0.00018

  30-Zn-65

  243.86  ± 0.20

  31-Ga-66

  0.3889  ± 0.0034

  31-Ga-67

  3.2616  ± 0.0004

  31-Ga-68

  0.04703  ± 0.00007

  34-Se-75

  119.778  ± 0.029

  36-Kr-85

  3927  ± 8

  38-Sr-85

  64.851  ± 0.005

  39-Y-88

  106.625  ± 0.024

  41-Nb-93m

  (5.73  ± 0.22) 10+3

  41-Nb-94

  (7.3  ± 0.9) 10+6

  41-Nb-95

  34.985  ± 0.012

  42-Mo-99

  2.7478  ± 0.0007

  43-Tc-99m

  0.250281  ± 0.000022

  44-Ru-103

  39.247  ± 0.013

  44-Ru-106

  371.8  ± 1.8

  45-Rh-106

  0.000348  ± 0.000004

  47-Ag-110m

  249.85  ± 0.10

  48-Cd-109

  461.4  ± 1.2

  49-In-111

  2.8049  ± 0.0006

  50-Sn-113

  115.09  ± 0.04

  51-Sb-125

  1007.48  ± 0.21

  52-Te-123m

  119.45  ± 0.25

  53-I-123

  0.55098  ± 0.00009

  53-I-125

  59.402  ± 0.014

  53-I-129

  (5.89  ± 0.23) 10+9

  53-I-131

  8.0228  ± 0.0024

  55-Cs-134

  753.5  ± 1.0

  55-Cs-137

  (1.099  ± 0.004) 10+4

  56-Ba-133

  3848.7  ± 1.2

  58-Ce-139

  137.642  ± 0.020

  58-Ce-141

  32.503  ± 0.014

  58-Ce-144

  285.1  ± 0.6

  62-Sm-153

  1.938  ± 0.010

  63-Eu-152

  4941  ± 7

  63-Eu-154

  3138.1  ± 1.4

  63-Eu-155

  1736  ± 6

  67-Ho-166

  1.1165  ± 0.0013

  67-Ho-166m

  (4.4  ± 0.7 ) 10+5

  69-Tm-170

  127.8  ± 0.8

  70-Yb-169

  32.016  ± 0.006

  77-Ir-192

  73.822  ± 0.009

  79-Au-198

  2.6950  ± 0.0007

  80-Hg-203

  46.594  ± 0.012

  81-Tl-201

  3.0422  ± 0.0017

  83-Bi-207

  (1.18  ± 0.03) 10+4

  88-Ra-226

  (5.862  ± 0.022) 10+5

  90-Th-228

  698.60 ± 0.23

  91-Pa-234m

  0.000805 ± 0.000011

  95-Am-241

  (1.5785  ± 0.0023) 10+5

  95-Am-243

  (2.692  ± 0.008) 10+6