<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Potassium-44
Summary data
General
Classification
Isotope: K-44
Atomic number (Z): 19
Mass number (A): 44
Neutron number (N): 25
Radioactive decay
Decay modes: β-
Half-life: 22.13 [m]
Decay constant: 5.2203e-04 [1/s]
Daughters: Ca-44 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.45667 [MeV]
Mean photon energy: 2.38464 [MeV]
Air kerma rate constant, Γ10: 7.412e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.412e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.334e-13 [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-:
2.334e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.821e-13
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/K-44 DPK.csv
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/K-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/K-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/K-44 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.68207e-01 |
2.250e-02 |
Gamma |
|
6.51355e-01 |
3.016e-02 |
Gamma |
|
7.26490e-01 |
3.770e-02 |
Gamma |
|
7.47630e-01 |
2.088e-02 |
Gamma |
|
8.76530e-01 |
1.728e-02 |
Gamma |
|
1.02474e+00 |
6.670e-02 |
Gamma |
|
1.12608e+00 |
7.598e-02 |
Gamma |
|
1.15700e+00 |
5.800e-01 |
Gamma |
|
1.49945e+00 |
7.830e-02 |
Gamma |
|
1.75263e+00 |
4.060e-02 |
Gamma |
|
1.77797e+00 |
2.117e-02 |
Gamma |
|
2.15079e+00 |
2.268e-01 |
Gamma |
|
2.51899e+00 |
9.686e-02 |
Gamma |
|
3.39551e+00 |
1.665e-02 |
Gamma |
|
3.66136e+00 |
6.090e-02 |
Gamma |
|
4.17709e-01 |
4.319e-02 |
Beta |
|
4.80749e-01 |
7.231e-02 |
Beta |
|
5.03339e-01 |
1.507e-02 |
Beta |
|
8.15721e-01 |
1.105e-01 |
Beta |
|
8.22516e-01 |
6.227e-02 |
Beta |
|
9.88810e-01 |
2.862e-01 |
Beta |
|
1.68598e+00 |
1.507e-02 |
Beta |
|
2.02614e+00 |
1.707e-02 |
Beta |
|
2.60063e+00 |
3.415e-01 |
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)
<= Return to MIRDspec isotope database
