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Radionuclide Dosimetric Data Sheets
Rhodium-99
Summary data
General
Classification
Isotope: Rh-99
Atomic number (Z): 45
Mass number (A): 99
Neutron number (N): 54
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 16.1 [d]
Decay constant: 4.9829e-07 [1/s]
Daughters: Ru-99 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.06114 [MeV]
Mean photon energy: 0.56269 [MeV]
Air kerma rate constant, Γ10: 3.244e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.401e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.796e-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-:
9.796e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.015e-14
[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/Rh-99 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/Rh-99 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/Rh-99 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/Rh-99 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.90938e-06 |
1.292e+01 |
X-ray |
|
2.54865e-03 |
3.443e-02 |
X-ray |
|
2.67727e-03 |
1.648e-02 |
X-ray |
|
1.91152e-02 |
2.818e-01 |
X-ray |
|
1.92483e-02 |
5.345e-01 |
X-ray |
|
2.16049e-02 |
4.485e-02 |
X-ray |
|
2.16277e-02 |
8.724e-02 |
X-ray |
|
2.20364e-02 |
1.691e-02 |
X-ray |
|
8.97600e-02 |
3.344e-01 |
Gamma |
|
1.75430e-01 |
2.014e-02 |
Gamma |
|
2.95700e-01 |
1.330e-02 |
Gamma |
|
3.22450e-01 |
6.232e-02 |
Gamma |
|
3.53050e-01 |
3.458e-01 |
Gamma |
|
4.42800e-01 |
2.242e-02 |
Gamma |
|
5.11000e-01 |
8.077e-02 |
Annihilation photon |
|
5.28240e-01 |
3.800e-01 |
Gamma |
|
6.18130e-01 |
4.180e-02 |
Gamma |
|
8.07250e-01 |
1.140e-02 |
Gamma |
|
9.40400e-01 |
1.292e-02 |
Gamma |
|
2.85192e-01 |
1.540e-02 |
Positron |
|
4.39078e-01 |
1.100e-02 |
Positron |
|
3.14576e-05 |
5.358e+00 |
Auger electron |
|
1.07650e-04 |
2.663e-01 |
Auger electron |
|
1.14366e-04 |
1.214e+00 |
Auger electron |
|
2.31891e-04 |
2.967e+00 |
Auger electron |
|
2.77181e-04 |
2.180e-02 |
Auger electron |
|
2.15887e-03 |
1.162e+00 |
Auger electron |
|
2.46827e-03 |
1.980e-01 |
Auger electron |
|
1.61570e-02 |
1.777e-01 |
Auger electron |
|
1.86981e-02 |
6.837e-02 |
Auger electron |
|
6.76730e-02 |
3.888e-01 |
Conversion electron |
|
8.65561e-02 |
3.612e-02 |
Conversion electron |
|
8.67882e-02 |
2.336e-02 |
Conversion electron |
|
8.69213e-02 |
3.010e-02 |
Conversion electron |
|
8.93007e-02 |
1.696e-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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