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Radionuclide Dosimetric Data Sheets
Rhodium-99m
Summary data
General
Classification
Isotope: Rh-99m
Atomic number (Z): 45
Mass number (A): 99
Neutron number (N): 54
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.7 [h]
Decay constant: 4.0966e-05 [1/s]
Daughters: Ru-99 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03674 [MeV]
Mean photon energy: 0.65108 [MeV]
Air kerma rate constant, Γ10: 2.997e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.281e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.886e-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-:
5.886e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.043e-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/Rh-99m 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-99m 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-99m 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-99m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.90921e-06 |
8.540e+00 |
X-ray |
|
2.54865e-03 |
2.277e-02 |
X-ray |
|
2.67727e-03 |
1.064e-02 |
X-ray |
|
1.91152e-02 |
1.907e-01 |
X-ray |
|
1.92483e-02 |
3.618e-01 |
X-ray |
|
2.16049e-02 |
3.036e-02 |
X-ray |
|
2.16277e-02 |
5.905e-02 |
X-ray |
|
2.20364e-02 |
1.145e-02 |
X-ray |
|
8.96000e-02 |
1.711e-02 |
Gamma |
|
2.76600e-01 |
1.633e-02 |
Gamma |
|
3.40800e-01 |
7.033e-01 |
Gamma |
|
5.11000e-01 |
1.468e-01 |
Annihilation photon |
|
5.28200e-01 |
1.400e-02 |
Gamma |
|
5.42800e-01 |
1.300e-02 |
Gamma |
|
6.17800e-01 |
1.200e-01 |
Gamma |
|
7.19300e-01 |
1.222e-02 |
Gamma |
|
9.36600e-01 |
2.200e-02 |
Gamma |
|
1.26120e+00 |
1.111e-01 |
Gamma |
|
3.57278e-01 |
6.853e-02 |
Positron |
|
3.14529e-05 |
3.542e+00 |
Auger electron |
|
1.07951e-04 |
1.837e-01 |
Auger electron |
|
1.14216e-04 |
8.010e-01 |
Auger electron |
|
2.31915e-04 |
1.961e+00 |
Auger electron |
|
2.77355e-04 |
1.442e-02 |
Auger electron |
|
2.15883e-03 |
7.651e-01 |
Auger electron |
|
2.46834e-03 |
1.304e-01 |
Auger electron |
|
1.61570e-02 |
1.203e-01 |
Auger electron |
|
1.86981e-02 |
4.628e-02 |
Auger electron |
|
6.75130e-02 |
2.001e-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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