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Radionuclide Dosimetric Data Sheets
Krypton-85m
Summary data
General
Classification
Isotope: Kr-85m
Atomic number (Z): 36
Mass number (A): 85
Neutron number (N): 49
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 4.48 [h]
Decay constant: 4.2978e-05 [1/s]
Daughters: Kr-85 (21.4%), Rb-85 (78.6%)
Radioactive daughters: Kr-85
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.2549 [MeV]
Mean photon energy: 0.15741 [MeV]
Air kerma rate constant, Γ10: 7.287e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.287e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.084e-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-:
4.084e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.522e-14
[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/Kr-85m 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/Kr-85m 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/Kr-85m 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/Kr-85m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52788e-05 |
3.255e-01 |
X-ray |
|
1.93809e-05 |
4.871e-01 |
X-ray |
|
1.25517e-02 |
1.160e-02 |
X-ray |
|
1.26066e-02 |
2.237e-02 |
X-ray |
|
1.33539e-02 |
1.196e-02 |
X-ray |
|
1.51195e-01 |
7.498e-01 |
Gamma |
|
3.04870e-01 |
1.402e-01 |
Gamma |
|
2.90457e-01 |
7.828e-01 |
Beta |
|
1.26043e-05 |
9.540e-02 |
Auger electron |
|
5.62811e-05 |
2.130e-01 |
Auger electron |
|
6.49856e-05 |
9.569e-02 |
Auger electron |
|
6.55194e-05 |
8.368e-02 |
Auger electron |
|
7.35540e-05 |
3.858e-02 |
Auger electron |
|
9.97470e-05 |
1.573e-02 |
Auger electron |
|
1.40735e-03 |
7.444e-02 |
Auger electron |
|
1.48960e-03 |
3.620e-02 |
Auger electron |
|
1.07980e-02 |
1.654e-02 |
Auger electron |
|
1.36036e-01 |
3.165e-02 |
Conversion electron |
|
2.90590e-01 |
6.143e-02 |
Conversion electron |
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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