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Radionuclide Dosimetric Data Sheets
Berkelium-246
Summary data
General
Classification
Isotope: Bk-246
Atomic number (Z): 97
Mass number (A): 246
Neutron number (N): 149
Radioactive decay
Decay modes: Electron capture
Half-life: 1.8 [d]
Decay constant: 4.4570e-06 [1/s]
Daughters: Cm-246 (100.0%)
Radioactive daughters: Cm-246
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05543 [MeV]
Mean photon energy: 0.85462 [MeV]
Air kerma rate constant, Γ10: 4.666e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.666e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.881e-15 [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-:
8.881e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.369e-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/Bk-246 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/Bk-246 Summary 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/Bk-246 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.76031e-05 |
2.182e+01 |
X-ray |
|
3.65383e-03 |
1.526e-01 |
X-ray |
|
1.26809e-02 |
2.320e-02 |
X-ray |
|
1.47568e-02 |
3.574e-02 |
X-ray |
|
1.49784e-02 |
3.138e-01 |
X-ray |
|
1.81285e-02 |
6.768e-02 |
X-ray |
|
1.86084e-02 |
2.296e-02 |
X-ray |
|
1.88687e-02 |
1.367e-02 |
X-ray |
|
1.95388e-02 |
2.404e-01 |
X-ray |
|
1.97249e-02 |
1.776e-02 |
X-ray |
|
2.28564e-02 |
5.646e-02 |
X-ray |
|
2.36395e-02 |
1.172e-02 |
X-ray |
|
1.05084e-01 |
1.886e-01 |
X-ray |
|
1.09866e-01 |
2.952e-01 |
X-ray |
|
1.22914e-01 |
3.441e-02 |
X-ray |
|
1.24031e-01 |
6.774e-02 |
X-ray |
|
1.27666e-01 |
1.794e-02 |
X-ray |
|
7.34300e-01 |
3.100e-02 |
Gamma |
|
7.98700e-01 |
6.100e-01 |
Gamma |
|
8.33500e-01 |
5.000e-02 |
Gamma |
|
1.03600e+00 |
1.750e-02 |
Gamma |
|
1.06200e+00 |
2.900e-02 |
Gamma |
|
1.07880e+00 |
3.700e-02 |
Gamma |
|
1.08140e+00 |
5.800e-02 |
Gamma |
|
1.12430e+00 |
4.400e-02 |
Gamma |
|
9.70471e-05 |
6.192e+00 |
Auger electron |
|
1.91705e-04 |
3.266e+00 |
Auger electron |
|
1.92960e-04 |
3.398e-02 |
Auger electron |
|
2.79470e-04 |
5.729e+00 |
Auger electron |
|
6.07730e-04 |
9.710e-01 |
Auger electron |
|
2.00346e-03 |
3.569e-01 |
Auger electron |
|
2.67027e-03 |
1.843e+00 |
Auger electron |
|
3.26414e-03 |
4.079e-01 |
Auger electron |
|
3.97232e-03 |
2.566e-02 |
Auger electron |
|
1.02460e-02 |
8.481e-02 |
Conversion electron |
|
1.11942e-02 |
4.442e-01 |
Auger electron |
|
1.49647e-02 |
2.349e-01 |
Auger electron |
|
1.82460e-02 |
1.323e-02 |
Conversion electron |
|
1.87804e-02 |
2.915e-02 |
Auger electron |
|
1.90240e-02 |
3.480e-01 |
Conversion electron |
|
2.38060e-02 |
2.965e-01 |
Conversion electron |
|
2.99710e-02 |
2.346e-02 |
Conversion electron |
|
3.79710e-02 |
1.832e-01 |
Conversion electron |
|
4.28000e-02 |
6.832e-02 |
Conversion electron |
|
7.54240e-02 |
1.825e-02 |
Conversion electron |
|
8.02060e-02 |
1.164e-02 |
Conversion electron |
|
8.29002e-02 |
1.190e-02 |
Auger 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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