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Radionuclide Dosimetric Data Sheets
Argon-44
Summary data
General
Classification
Isotope: Ar-44
Atomic number (Z): 18
Mass number (A): 44
Neutron number (N): 26
Radioactive decay
Decay modes: β-
Half-life: 11.87 [m]
Decay constant: 9.7325e-04 [1/s]
Daughters: K-44 (100.0%)
Radioactive daughters: K-44
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.52445 [MeV]
Mean photon energy: 1.93763 [MeV]
Air kerma rate constant, Γ10: 6.141e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.141e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.403e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
8.403e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.104e-13
[Gy·kg/Bq·s]
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Ar-44 Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Ar-44 Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Ar-44 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.82600e-01 |
6.600e-01 |
Gamma |
|
4.08100e-01 |
4.092e-02 |
Gamma |
|
4.26700e-01 |
2.640e-02 |
Gamma |
|
8.09100e-01 |
1.980e-02 |
Gamma |
|
8.66100e-01 |
1.630e-02 |
Gamma |
|
1.05130e+00 |
3.960e-02 |
Gamma |
|
1.11470e+00 |
2.178e-02 |
Gamma |
|
1.27660e+00 |
1.538e-02 |
Gamma |
|
1.46000e+00 |
2.178e-02 |
Gamma |
|
1.70340e+00 |
5.650e-01 |
Gamma |
|
1.88610e+00 |
3.148e-01 |
Gamma |
|
1.92601e-01 |
2.067e-02 |
Beta |
|
2.93614e-01 |
3.007e-02 |
Beta |
|
4.83718e-01 |
8.740e-01 |
Beta |
|
6.76841e-01 |
1.278e-02 |
Beta |
|
1.27929e+00 |
6.108e-02 |
Beta |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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