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Radionuclide Dosimetric Data Sheets
Krypton-77
Summary data
General
Classification
Isotope: Kr-77
Atomic number (Z): 36
Mass number (A): 77
Neutron number (N): 41
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 74.4 [m]
Decay constant: 1.5527e-04 [1/s]
Daughters: Br-77 (90.4%), Br-77m (9.61%)
Radioactive daughters: Br-77, Br-77m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.67444 [MeV]
Mean photon energy: 1.03839 [MeV]
Air kerma rate constant, Γ10: 1.241e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.404e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.081e-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-:
1.081e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.664e-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-77 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-77 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-77 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-77 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.75885e-05 |
2.035e+00 |
X-ray |
|
1.18329e-02 |
4.316e-02 |
X-ray |
|
1.18814e-02 |
8.333e-02 |
X-ray |
|
1.32502e-02 |
1.161e-02 |
X-ray |
|
1.29640e-01 |
8.100e-01 |
Gamma |
|
1.46590e-01 |
3.726e-01 |
Gamma |
|
2.76000e-01 |
2.916e-02 |
Gamma |
|
3.11900e-01 |
3.726e-02 |
Gamma |
|
5.11000e-01 |
1.634e+00 |
Annihilation photon |
|
7.13923e-01 |
2.716e-02 |
Positron |
|
7.78404e-01 |
3.289e-01 |
Positron |
|
8.45591e-01 |
4.026e-01 |
Positron |
|
9.05308e-01 |
4.850e-02 |
Positron |
|
4.38516e-05 |
9.164e-01 |
Auger electron |
|
5.76799e-05 |
3.538e-01 |
Auger electron |
|
9.00302e-05 |
5.936e-02 |
Auger electron |
|
1.32060e-03 |
3.055e-01 |
Auger electron |
|
1.41121e-03 |
1.811e-02 |
Auger electron |
|
1.02029e-02 |
6.905e-02 |
Auger electron |
|
1.07650e-02 |
3.054e-02 |
Conversion electron |
|
1.16354e-02 |
2.112e-02 |
Auger electron |
|
2.26464e-02 |
1.170e-02 |
Conversion electron |
|
1.16205e-01 |
2.832e-02 |
Conversion electron |
|
1.33155e-01 |
1.690e-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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