<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Tungsten-185m
Summary data
General
Classification
Isotope: W-185m
Atomic number (Z): 74
Mass number (A): 185
Neutron number (N): 111
Radioactive decay
Decay modes: Internal transition
Half-life: 1.597 [m]
Decay constant: 7.2338e-03 [1/s]
Daughters: W-185 (100.0%)
Radioactive daughters: W-185
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.17378 [MeV]
Mean photon energy: 0.02873 [MeV]
Air kerma rate constant, Γ10: 2.701e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.701e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.784e-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-:
2.784e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.603e-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/W-185m 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/W-185m 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/W-185m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.12583e-05 |
1.618e+01 |
X-ray |
|
1.77948e-03 |
5.922e-02 |
X-ray |
|
7.40950e-03 |
1.109e-02 |
X-ray |
|
8.32491e-03 |
1.884e-02 |
X-ray |
|
8.38982e-03 |
1.662e-01 |
X-ray |
|
9.69188e-03 |
1.775e-01 |
X-ray |
|
9.95866e-03 |
2.948e-02 |
X-ray |
|
1.13130e-02 |
3.303e-02 |
X-ray |
|
5.81161e-02 |
2.558e-02 |
X-ray |
|
5.94830e-02 |
4.441e-02 |
X-ray |
|
6.58600e-02 |
5.802e-02 |
Gamma |
|
1.31550e-01 |
4.330e-02 |
Gamma |
|
1.73680e-01 |
3.265e-02 |
Gamma |
|
2.53223e-05 |
3.214e+00 |
Auger electron |
|
1.61709e-04 |
5.515e+00 |
Auger electron |
|
3.15749e-04 |
1.936e-01 |
Auger electron |
|
3.22723e-04 |
1.103e+00 |
Auger electron |
|
7.75190e-04 |
2.129e-01 |
Auger electron |
|
1.47651e-03 |
2.522e+00 |
Auger electron |
|
1.66562e-03 |
1.631e-01 |
Auger electron |
|
6.61822e-03 |
7.752e-01 |
Auger electron |
|
7.25880e-03 |
2.517e-02 |
Conversion electron |
|
8.37923e-03 |
2.983e-01 |
Auger electron |
|
1.01708e-02 |
2.857e-02 |
Auger electron |
|
1.14630e-02 |
6.984e-02 |
Conversion electron |
|
1.14630e-02 |
3.097e-02 |
Conversion electron |
|
1.19670e-02 |
2.658e-02 |
Conversion electron |
|
1.33340e-02 |
2.536e-02 |
Conversion electron |
|
1.33340e-02 |
1.730e-02 |
Conversion electron |
|
2.12688e-02 |
2.876e-02 |
Conversion electron |
|
2.12688e-02 |
1.322e-02 |
Conversion electron |
|
3.07170e-02 |
5.075e-02 |
Conversion electron |
|
3.20840e-02 |
5.683e-02 |
Conversion electron |
|
4.00188e-02 |
2.732e-02 |
Conversion electron |
|
5.37830e-02 |
5.937e-02 |
Conversion electron |
|
5.42870e-02 |
2.694e-01 |
Conversion electron |
|
5.56540e-02 |
2.679e-01 |
Conversion electron |
|
6.18610e-02 |
5.918e-02 |
Conversion electron |
|
6.35888e-02 |
1.500e-01 |
Conversion electron |
|
6.58600e-02 |
4.174e-02 |
Conversion electron |
|
1.19473e-01 |
1.396e-02 |
Conversion electron |
|
1.19977e-01 |
3.427e-01 |
Conversion electron |
|
1.21344e-01 |
2.398e-01 |
Conversion electron |
|
1.29279e-01 |
1.595e-01 |
Conversion electron |
|
1.31550e-01 |
4.480e-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)
<= Return to MIRDspec isotope database
