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Radionuclide Dosimetric Data Sheets
Potassium-46
Summary data
General
Classification
Isotope: K-46
Atomic number (Z): 19
Mass number (A): 46
Neutron number (N): 27
Radioactive decay
Decay modes: β-
Half-life: 105.0 [s]
Decay constant: 6.6014e-03 [1/s]
Daughters: Ca-46 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 2.31611 [MeV]
Mean photon energy: 2.87096 [MeV]
Air kerma rate constant, Γ10: 8.494e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.494e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.711e-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-:
3.711e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.600e-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-46 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-46 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-46 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-46 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.23500e+00 |
6.400e-02 |
Gamma |
|
1.34500e+00 |
1.000e+00 |
Gamma |
|
1.43500e+00 |
1.200e-02 |
Gamma |
|
1.67500e+00 |
3.500e-02 |
Gamma |
|
2.06000e+00 |
4.500e-02 |
Gamma |
|
2.28500e+00 |
5.100e-02 |
Gamma |
|
3.02000e+00 |
2.200e-02 |
Gamma |
|
3.71000e+00 |
1.100e-02 |
Gamma |
|
3.73500e+00 |
2.140e-01 |
Gamma |
|
4.07500e+00 |
2.100e-02 |
Gamma |
|
4.23000e+00 |
1.900e-02 |
Gamma |
|
4.10996e-01 |
2.096e-02 |
Beta |
|
5.57382e-01 |
1.497e-02 |
Beta |
|
1.12407e+00 |
2.495e-01 |
Beta |
|
1.82347e+00 |
4.990e-02 |
Beta |
|
2.34547e+00 |
2.994e-02 |
Beta |
|
2.94090e+00 |
6.287e-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)
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