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Radionuclide Half-Life Measurements Made at NIST

M. P. Unterweger, D. D. Hoppes, F. J. Schima, and  J. S. Coursey

  Radionuclide 
  Number of  
Sources
Number of
  Half Lives  
Followed
  Half Life*   Statistical
Standard
  Uncertainty  
Other
Standard
  Uncertainty  
  References

3H 18 3   4500 ± 8 d  8 0 1 (a)
18F 3 13.1   1.82951 ± 0.00034 h  0.00024 0.00024 §
22Na 5 1.9 - 4.7   950.97 ± 0.15 d  0.09 0.12 §
24Na 14 1.1 - 7.6   14.9512 ± 0.0032 h  0.0009 0.0031 §
32P 2 2.8   14.263 ± 0.003 d  0.003 0.0 6
44Ti 1 0.35   22154 ± 456 d  180 419 2
46Sc 4 3.6 - 10.3   83.831 ± 0.066 d  0.030 0.059 §
51Cr 11 2.3 - 8.9   27.7010 ± 0.0012 d  0.0007 0.0009 §
54Mn 2 3.3 - 7.4   312.028 ± 0.034 d  0.034 0.0 §
57Co 7 4.7 - 10.4   272.11 ± 0.26 d  0.09 0.25 §
58Co 1 9.1   70.77  ± 0.11 d  0.11 0.0 §
59Fe 6 4.0 - 9.3   44.5074 ± 0.0072 d  0.0048 0.0053 §
60Co 8 3.7 - 5.3   1925.20 ± 0.25 d  0.10 0.23 §,6
62Cu 3 2.7 - 3.9   9.6725 ± 0.0080 min  0.0080 0.0 3,6
65Zn 1 3.2   244.164 ± 0.099 d  0.099 0.0 §
67Ga 13 1.8 - 8.3   3.26154 ± 0.00054 d  0.00015 0.00052 §
75Se 19 2.4 - 8.7   119.809 ± 0.066 d  0.014 0.065 §
85Kr 1 1.9   3935.7 ± 1.2 d  1.2 0.0 §,6
85Sr 8 1.1 - 4.8   64.8530 ± 0.0081 d  0.0039 0.0071 §
88Y 8 1.3 - 8.1   106.626 ± 0.044 d  0.017 0.041 §
99Mo 14 3.6 - 9.5   65.9239 ± 0.0058 h  0.0031 0.0049 §
99mTc 33 2.1 - 12.0   6.00718 ± 0.00087 h  0.00015 0.00086 § (b)
99mTc 17 1.9 - 8.0   6.0123 ± 0.0032 h  0.0007 0.0031 6 (c)
103Ru 7 0.4   39.310 ± 0.044 d  0.044 0.0 6
109Cd 2 3.4 - 5.3   463.26 ± 0.63 d  0.36 0.51 §
110mAg 1 9.3   249.950 ± 0.024 d  0.024 0.0 §
111In 11 1.4 - 9.3   2.80477 ± 0.00053 d  0.00017 0.00051 §
113Sn 11 2.3 - 11.0   115.079 ± 0.080 d  0.025 0.076 §
117mSn 10 1.5 - 4.0   14.00 ± 0.05 d  0.05 0.0 4
123I 3 5.4 - 12.7   13.2235 ± 0.0019 h  0.0019 0.0 §
125I 18 1.4 - 6.2   59.49  ± 0.13 d  0.03 0.12 §
125Sb 1 5.4   1007.56 ± 0.10 d  0.10 0.0 §,6
127Xe 5 1.1 - 11.5   36.3446 ± 0.0028 d  0.0028 0.0 §
131I 21 1.0 - 10.9   8.0197 ± 0.0022 d  0.0005 0.0021 §
131mXe 2 1.8   11.934 ± 0.021 d  0.014 0.016 §
133Ba 4 2.0   3854.7 ± 2.8 d  1.3 2.5 §,6
133Xe 3 4.8 - 11.2   5.24747 ± 0.00045 d  0.00045 0.0 §
134Cs 5 1.7 - 3.0   753.88 ± 0.15 d  0.11 0.11 §
137Cs 6 0.7 - 0.9   11018.3 ± 9.5 d  3.5 8.8 §,6
139Ce 9 1.5 - 6.4   137.734 ± 0.091 d  0.029 0.086 §
140Ba 10 1.8 - 4.4   12.7527 ± 0.0023 d  0.0009 0.0022 §
140La 2 4.2   40.293 ± 0.012 h  0.008 0.009 §
141Ce 1 6.1   32.510 ± 0.024 d  0.024 0.0 §
144Ce 1 3.9   284.534 ± 0.032 d  0.032 0.0 §,6
152Eu 4 1.6 - 1.8   4947.2 ± 1.1 d  0.7 0.8 §,6
153Gd 2 7.3   239.472 ± 0.069 d  0.041 0.055 §
153Sm 1 7.3   46.2853 ± 0.0014 h  0.0014 0.0 §
154Eu 3 2.4   3145.2 ± 1.1 d  1.1 0.0 §,6
155Eu 2 3.1 - 4.3   1739.06 ± 0.45 d  0.45 0.0 §,6
166Ho 2 5.4 - 7.2   26.794 ± 0.023 h  0.013 0.019 §,6
169Yb 14 3.4 - 9.5   32.0147 ± 0.0093 d  0.0026 0.0089 §
177Lu 4 2 - 5   6.64 ± 0.01 d  0.01 0.0 5
181W 3 5.9 - 6.6   121.095 ± 0.064 d  0.042 0.048 §
186Re 2 5.7 - 6.5   89.248 ± 0.069 h  0.018 0.067 §
188Re 3 4.2 - 7.1   17.001 ± 0.022 h  0.09 0.021 §,6
188W 1 4.0   69.783 ± 0.048 d  0.048 0.0 6
192Ir 1 2.4   73.810 ± 0.019 d  0.019 0.0 §
195Au 5 0.6 - 6.0   186.098 ± 0.047 d  0.021 0.042 §
198Au 4 4.5 - 7.4   2.69517 ± 0.00021 d  0.00021 0.0 §
201Tl 12 2.6 - 11.5   3.0456 ± 0.0015 d  0.0004 0.0014 §
202Tl 1 1.4   12.466 ± 0.081 d  0.081 0.0 §
203Hg 14 1.7 - 6.6   46.619 ± 0.027 d  0.007 0.026 §
203Pb 7 1.8 - 2.8   51.923 ± 0.037 h  0.013 0.034 §
207Bi 2 0.9   11523. ± 15. d  9 12 §,6
228Th 6 1.7 - 8.3   698.60 ± 0.36 d  0.14 0.33 §

* The stated uncertainties are the sum, in quadrature, of the statistical uncertainty (the "external standard deviation" in the weighted mean) and other uncertainties which include those from the Stevenson equation (NBS Special Publication 626) and from the correction for the 210Bi ingrowth in the radium reference sources.
(a) Measured by internal gas proportional counting.
(b) Normal saline solution.
(c) Acid solution.

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