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Radionuclide Dosimetric Data Sheets
Berkelium-250
Summary data
General
Classification
Isotope: Bk-250
Atomic number (Z): 97
Mass number (A): 250
Neutron number (N): 153
Radioactive decay
Decay modes: β-
Half-life: 3.212 [h]
Decay constant: 5.9944e-05 [1/s]
Daughters: Cf-250 (100.0%)
Radioactive daughters: Cf-250
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.29491 [MeV]
Mean photon energy: 0.89825 [MeV]
Air kerma rate constant, Γ10: 3.561e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.561e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.725e-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-:
4.725e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.439e-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-250 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-250 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-250 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-250 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.45983e-05 |
5.073e+00 |
X-ray |
|
3.87064e-03 |
3.846e-02 |
X-ray |
|
1.56809e-02 |
7.348e-02 |
X-ray |
|
1.90028e-02 |
1.605e-02 |
X-ray |
|
2.07498e-02 |
8.257e-02 |
X-ray |
|
2.42552e-02 |
1.973e-02 |
X-ray |
|
8.89956e-01 |
1.530e-02 |
Gamma |
|
9.29468e-01 |
1.233e-02 |
Gamma |
|
9.89125e-01 |
4.500e-01 |
Gamma |
|
1.02865e+00 |
4.905e-02 |
Gamma |
|
1.03185e+00 |
3.559e-01 |
Gamma |
|
2.14339e-01 |
6.223e-02 |
Beta |
|
2.27883e-01 |
8.330e-01 |
Beta |
|
5.74282e-01 |
4.894e-02 |
Beta |
|
5.93948e-01 |
4.894e-02 |
Beta |
|
1.14519e-04 |
1.371e+00 |
Auger electron |
|
1.91001e-04 |
8.287e-01 |
Auger electron |
|
3.34867e-04 |
1.342e+00 |
Auger electron |
|
6.47438e-04 |
2.352e-01 |
Auger electron |
|
2.00175e-03 |
4.973e-02 |
Auger electron |
|
2.80321e-03 |
4.281e-01 |
Auger electron |
|
3.46476e-03 |
1.031e-01 |
Auger electron |
|
1.18084e-02 |
1.020e-01 |
Auger electron |
|
1.58159e-02 |
5.491e-02 |
Auger electron |
|
1.74980e-02 |
1.907e-01 |
Conversion electron |
|
2.28110e-02 |
1.563e-01 |
Conversion electron |
|
3.76362e-02 |
1.011e-01 |
Conversion electron |
|
4.27400e-02 |
3.727e-02 |
Conversion electron |
|
7.39240e-02 |
1.297e-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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