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Radionuclide Dosimetric Data Sheets
Rhodium-109
Summary data
General
Classification
Isotope: Rh-109
Atomic number (Z): 45
Mass number (A): 109
Neutron number (N): 64
Radioactive decay
Decay modes: β-
Half-life: 80.0 [s]
Decay constant: 8.6643e-03 [1/s]
Daughters: Pd-109 (100.0%)
Radioactive daughters: Pd-109
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.93199 [MeV]
Mean photon energy: 0.29948 [MeV]
Air kerma rate constant, Γ10: 1.205e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.205e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.493e-13 [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-:
1.493e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.798e-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-109 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-109 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-109 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-109 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.85999e-06 |
1.362e+00 |
X-ray |
|
2.09884e-02 |
2.781e-02 |
X-ray |
|
2.11504e-02 |
5.253e-02 |
X-ray |
|
3.53400e-02 |
1.248e-02 |
Gamma |
|
1.13350e-01 |
5.460e-02 |
Gamma |
|
1.78030e-01 |
7.332e-02 |
Gamma |
|
2.15280e-01 |
1.664e-02 |
Gamma |
|
2.45030e-01 |
1.248e-02 |
Gamma |
|
2.49160e-01 |
5.616e-02 |
Gamma |
|
2.76260e-01 |
2.080e-02 |
Gamma |
|
2.91360e-01 |
7.228e-02 |
Gamma |
|
3.25430e-01 |
1.404e-02 |
Gamma |
|
3.26830e-01 |
5.200e-01 |
Gamma |
|
3.78050e-01 |
1.196e-02 |
Gamma |
|
4.26140e-01 |
7.436e-02 |
Gamma |
|
8.12158e-01 |
9.086e-02 |
Beta |
|
8.37681e-01 |
2.126e-02 |
Beta |
|
8.64606e-01 |
8.022e-02 |
Beta |
|
9.10314e-01 |
6.379e-01 |
Beta |
|
1.06181e+00 |
1.546e-01 |
Beta |
|
3.82271e-05 |
5.127e-01 |
Auger electron |
|
1.21835e-04 |
2.521e-02 |
Auger electron |
|
1.26725e-04 |
1.358e-01 |
Auger electron |
|
2.92788e-04 |
3.331e-01 |
Auger electron |
|
2.38239e-03 |
1.286e-01 |
Auger electron |
|
2.75666e-03 |
2.607e-02 |
Auger electron |
|
1.10190e-02 |
5.498e-02 |
Conversion electron |
|
1.76856e-02 |
1.467e-02 |
Auger electron |
|
3.20074e-02 |
1.158e-02 |
Conversion electron |
|
3.21694e-02 |
1.688e-02 |
Conversion electron |
|
8.90290e-02 |
3.852e-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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