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Radionuclide Dosimetric Data Sheets
Indium-109
Summary data
General
Classification
Isotope: In-109
Atomic number (Z): 49
Mass number (A): 109
Neutron number (N): 60
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.2 [h]
Decay constant: 4.5843e-05 [1/s]
Daughters: Cd-109 (100.0%)
Radioactive daughters: Cd-109
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03344 [MeV]
Mean photon energy: 0.64407 [MeV]
Air kerma rate constant, Γ10: 2.738e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.919e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.358e-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-:
5.358e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.032e-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/In-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/In-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/In-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/In-109 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.71475e-05 |
7.580e+00 |
X-ray |
|
3.12254e-03 |
2.923e-02 |
X-ray |
|
3.31083e-03 |
1.495e-02 |
X-ray |
|
2.29571e-02 |
2.122e-01 |
X-ray |
|
2.31527e-02 |
3.989e-01 |
X-ray |
|
2.60401e-02 |
3.519e-02 |
X-ray |
|
2.60753e-02 |
6.837e-02 |
X-ray |
|
2.66158e-02 |
1.390e-02 |
X-ray |
|
7.48000e-02 |
2.205e-02 |
Gamma |
|
8.41000e-02 |
2.940e-02 |
Gamma |
|
2.03500e-01 |
7.350e-01 |
Gamma |
|
2.88400e-01 |
1.617e-02 |
Gamma |
|
3.47500e-01 |
2.132e-02 |
Gamma |
|
4.26200e-01 |
4.116e-02 |
Gamma |
|
5.11000e-01 |
9.315e-02 |
Annihilation photon |
|
6.13600e-01 |
2.278e-02 |
Gamma |
|
6.19000e-01 |
1.764e-02 |
Gamma |
|
6.23500e-01 |
5.513e-02 |
Gamma |
|
6.49800e-01 |
2.866e-02 |
Gamma |
|
6.52900e-01 |
1.617e-02 |
Gamma |
|
8.22500e-01 |
1.249e-02 |
Gamma |
|
9.49100e-01 |
1.470e-02 |
Gamma |
|
1.04970e+00 |
1.169e-02 |
Gamma |
|
1.14910e+00 |
4.337e-02 |
Gamma |
|
1.19650e+00 |
1.617e-02 |
Gamma |
|
1.41920e+00 |
1.264e-02 |
Gamma |
|
1.62230e+00 |
1.985e-02 |
Gamma |
|
1.86060e+00 |
1.470e-02 |
Gamma |
|
3.56244e-01 |
4.634e-02 |
Positron |
|
3.67758e-05 |
2.678e+00 |
Auger electron |
|
1.28078e-04 |
7.808e-01 |
Auger electron |
|
1.66000e-04 |
1.653e-01 |
Auger electron |
|
3.45353e-04 |
1.868e+00 |
Auger electron |
|
4.03098e-04 |
2.127e-02 |
Auger electron |
|
2.61042e-03 |
7.204e-01 |
Auger electron |
|
3.05347e-03 |
1.659e-01 |
Auger electron |
|
3.51452e-03 |
1.005e-02 |
Auger electron |
|
1.92752e-02 |
9.417e-02 |
Auger electron |
|
2.24238e-02 |
3.875e-02 |
Auger electron |
|
3.32120e-02 |
1.029e-02 |
Conversion electron |
|
1.76812e-01 |
4.264e-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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