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Radionuclide Dosimetric Data Sheets
Berkelium-248m
Summary data
General
Classification
Isotope: Bk-248m
Atomic number (Z): 97
Mass number (A): 248
Neutron number (N): 151
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 23.7 [h]
Decay constant: 8.1241e-06 [1/s]
Daughters: Cf-248 (70.0%), Cm-248 (30.0%)
Radioactive daughters: Cf-248, Cm-248
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.19102 [MeV]
Mean photon energy: 0.05592 [MeV]
Air kerma rate constant, Γ10: 6.541e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.541e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.060e-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-:
3.060e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.959e-15
[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-248m 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-248m 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/Bk-248m 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/Bk-248m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.45988e-05 |
2.360e+00 |
X-ray |
|
7.75898e-05 |
3.868e+00 |
X-ray |
|
3.64967e-03 |
2.714e-02 |
X-ray |
|
3.87045e-03 |
1.789e-02 |
X-ray |
|
1.49784e-02 |
5.960e-02 |
X-ray |
|
1.56809e-02 |
3.437e-02 |
X-ray |
|
1.81285e-02 |
1.286e-02 |
X-ray |
|
1.95388e-02 |
3.922e-02 |
X-ray |
|
2.07498e-02 |
3.837e-02 |
X-ray |
|
1.05084e-01 |
6.276e-02 |
X-ray |
|
1.09866e-01 |
9.822e-02 |
X-ray |
|
1.22914e-01 |
1.145e-02 |
X-ray |
|
1.24031e-01 |
2.254e-02 |
X-ray |
|
5.50700e-01 |
4.970e-02 |
Gamma |
|
7.61977e-02 |
5.000e-02 |
Beta |
|
2.55774e-01 |
2.000e-01 |
Beta |
|
2.70367e-01 |
4.500e-01 |
Beta |
|
9.70385e-05 |
1.097e+00 |
Auger electron |
|
1.14519e-04 |
6.376e-01 |
Auger electron |
|
1.90988e-04 |
3.855e-01 |
Auger electron |
|
1.91677e-04 |
5.769e-01 |
Auger electron |
|
2.78471e-04 |
1.016e+00 |
Auger electron |
|
3.34785e-04 |
6.244e-01 |
Auger electron |
|
5.96601e-04 |
1.692e-01 |
Auger electron |
|
6.46127e-04 |
1.093e-01 |
Auger electron |
|
1.98830e-03 |
2.248e-02 |
Auger electron |
|
2.01102e-03 |
6.167e-02 |
Auger electron |
|
2.66547e-03 |
3.287e-01 |
Auger electron |
|
2.80300e-03 |
1.992e-01 |
Auger electron |
|
3.25785e-03 |
7.267e-02 |
Auger electron |
|
3.46451e-03 |
4.798e-02 |
Auger electron |
|
1.10861e-02 |
8.113e-02 |
Auger electron |
|
1.17964e-02 |
4.752e-02 |
Auger electron |
|
1.48476e-02 |
4.286e-02 |
Auger electron |
|
1.58028e-02 |
2.558e-02 |
Auger electron |
|
1.62880e-02 |
9.637e-02 |
Conversion electron |
|
1.96240e-02 |
2.531e-02 |
Conversion electron |
|
2.16010e-02 |
7.963e-02 |
Conversion electron |
|
2.44060e-02 |
2.143e-02 |
Conversion electron |
|
3.64262e-02 |
5.124e-02 |
Conversion electron |
|
3.85710e-02 |
1.327e-02 |
Conversion electron |
|
4.15300e-02 |
1.889e-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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