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Radionuclide Dosimetric Data Sheets
Krypton-74
Summary data
General
Classification
Isotope: Kr-74
Atomic number (Z): 36
Mass number (A): 74
Neutron number (N): 38
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 11.5 [m]
Decay constant: 1.0046e-03 [1/s]
Daughters: Br-74 (100.0%)
Radioactive daughters: Br-74
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.60062 [MeV]
Mean photon energy: 1.05792 [MeV]
Air kerma rate constant, Γ10: 1.906e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.894e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.623e-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-:
9.623e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.695e-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/Kr-74 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-74 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-74 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-74 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.76044e-05 |
6.165e+00 |
X-ray |
|
9.85000e-03 |
4.340e-02 |
Gamma |
|
1.18329e-02 |
7.123e-02 |
X-ray |
|
1.18814e-02 |
1.375e-01 |
X-ray |
|
1.32502e-02 |
1.917e-02 |
X-ray |
|
6.28400e-02 |
9.610e-02 |
Gamma |
|
6.72900e-02 |
1.457e-02 |
Gamma |
|
8.97000e-02 |
3.100e-01 |
Gamma |
|
9.38100e-02 |
3.286e-02 |
Gamma |
|
1.23360e-01 |
8.370e-02 |
Gamma |
|
1.29600e-01 |
2.170e-02 |
Gamma |
|
1.40270e-01 |
8.060e-02 |
Gamma |
|
1.49720e-01 |
2.139e-02 |
Gamma |
|
2.02980e-01 |
1.798e-01 |
Gamma |
|
2.16900e-01 |
8.060e-02 |
Gamma |
|
2.33880e-01 |
4.340e-02 |
Gamma |
|
2.96670e-01 |
9.920e-02 |
Gamma |
|
3.06510e-01 |
9.300e-02 |
Gamma |
|
5.11000e-01 |
1.544e+00 |
Annihilation photon |
|
6.09200e-01 |
1.054e-02 |
Gamma |
|
7.01300e-01 |
1.457e-02 |
Gamma |
|
5.44305e-01 |
1.876e-02 |
Positron |
|
5.85520e-01 |
1.876e-02 |
Positron |
|
7.22156e-01 |
3.160e-01 |
Positron |
|
7.64845e-01 |
2.468e-01 |
Positron |
|
7.80084e-01 |
1.382e-02 |
Positron |
|
8.21242e-01 |
7.899e-02 |
Positron |
|
8.57891e-01 |
4.937e-02 |
Positron |
|
4.39998e-05 |
2.756e+00 |
Auger electron |
|
5.83678e-05 |
1.098e+00 |
Auger electron |
|
9.62377e-05 |
3.848e-01 |
Auger electron |
|
1.32774e-03 |
8.318e-01 |
Auger electron |
|
1.42511e-03 |
5.082e-02 |
Auger electron |
|
8.08080e-03 |
3.461e-01 |
Conversion electron |
|
8.24790e-03 |
2.683e-02 |
Conversion electron |
|
9.66522e-03 |
6.214e-02 |
Conversion electron |
|
1.02029e-02 |
1.139e-01 |
Auger electron |
|
1.16354e-02 |
3.486e-02 |
Auger electron |
|
4.94050e-02 |
3.222e-02 |
Conversion electron |
|
5.38550e-02 |
2.520e-02 |
Conversion electron |
|
5.89450e-02 |
1.201e-02 |
Conversion electron |
|
7.62650e-02 |
3.836e-02 |
Conversion electron |
|
8.03750e-02 |
1.743e-02 |
Conversion electron |
|
1.09925e-01 |
2.230e-02 |
Conversion electron |
|
1.26835e-01 |
1.048e-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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