β+-Decay Evaluated Data

1949BL26: 18F.
1951RU24: 18F.
1956DR38: 18F.
1958BE74: 18F.
1964HO28: 18F; measured not abstracted; deduced nuclear properties.
1964MA12: 18F; measured not abstracted; deduced nuclear properties.
1965BO42: 18F; measured T1/2.
1965EB01: 18F; measured T1/2.
1980RUZY: 18F; compiled T1/2.
1983CO20: 18F(β+), (EC); measured β+ emission rates.
1984EVZZ: 18F(β+), (EC); measured γ CP.
1985DO02: 18F(β+), (EC); analyzed γ CP.
1985EVZZ: 18F(β+), (EC); measured γ CP; deduced pion-nucleon-nucleon coupling constant limit.
1989SC17: 18F(β+), (EC); measured T1/2.
2001ME26: 18F(EC); measured T1/2.
2002UN02: 18F; compiled T1/2.
2004SC04: 18F; measured T1/2.
2007GA01: 18F(β+); measured Eγ, Iγ.
2009BAZT: 18F(β+); measured Eβ, Iβ, Eγ, Iγ, β-γ-coin.; deduced J, π, transition strengths.
2010GA04: 18F(EC); measured Eγ, Iγ, Ee, Ie; deduced T1/2.
2012FI12: 18F; analyzed half-lives. Corrections made to measured half-lives with NIST Ionization Chamber "A" for sample position slippage over time.
2012HA35: 18F(EC); measured decay products, Eγ, Iγ; deduced T1/2.
2012TR02: 18F(EC); measured decay products, Eγ, Iγ; deduced T1/2. Comparison with ENSDF value.
2014UN01: 18F(EC); analyzed decay products, Eβ, Iβ, Eγ, Iγ; deduced T1/2. updated values. NIST correction for source-holder instability.
2014DI01: 18F(β+); measured Eγ, Iγ, half-life.
2015KA41: 18F(β+); measured decay products, Eγ, Iγ; deduced T1/2 and its uncertainty.
2020VA03: 18F(EC),(β+); measured decay products, Eβ, Iβ, Eγ, Iγ; deduced the absolute activity.
Measured half-life for 18F(β+)18O

Recommended value (August, 2019): 109.732 ± 0.011 min
Summary Table of Uncertainty Analysis:  Table 18F preview (PDF) Graph of Life-Time: Graph 18F preview (PDF)
Measured values: 109.73 ± 0.14 min (2015KA41)
109.6 ± 0.7 min (2014DI01)
109.72 ± 0.19 min (2012HA35)
109.723 ± 0.011 min (2010GA04)
109.749 ± 0.021 min (2004SC04)
109.771 ± 0.021 min (2002UN02, 2012FI12, 2014UN01)
109.70 ± 0.11 min (1989SC17)
109.71 ± 0.02 min (1980RUZY)
111.0 ± 2.0 min (1965BO42)
109.87 ± 0.12 min (1965EB01)
110.5 ± 0.6 min (1964HO28)
109.72 ± 0.06 min (1964MA12)
109.8 ± 1.2 min (1958BE74)
111 ± 1 min (1955JA1A)
112 ± 1 min (1949BL26)
Other Reviews:  109.728 ± 0.019 min  from LNHB evaluation. (Be et al., Nucleide, Table of Radionuclide on CD-Rom,
    Version 2000, CEA/BNM-LNHB, 91191 Gif-sur-Yvette, France.).

Previous Measurements


Eβ(max) (keV) log ft εK+
(1949BL26) 635 ± 15 (1949BL26) 3.62   (1956DR38) 0.030 ± 0.002
(1951RU24) 649 ± 9   a 3.554    
(1964HO28) 635 ± 2   1969KA1B 3.568 ± 0.001    
(1970AL11) 632.9 ± 0.7 b        
(2007GA01) 633.5        
a) Using T1/2 = 109.77 ± 0.05 min; see (1972AJ02).
b) Using standard masses from (1965MA54).

18C(β-)18N Evaluated Data

18N(β-)18O Evaluated Data

18Ne(β+)18F Evaluated Data

A = 18 Beta-Decays Diagram

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Last modified: 24 June 2021