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Radionuclide Dosimetric Data Sheets
Indium-117m
Summary data
General
Classification
Isotope: In-117m
Atomic number (Z): 49
Mass number (A): 117
Neutron number (N): 68
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 116.2 [m]
Decay constant: 9.9419e-05 [1/s]
Daughters: In-117 (47.1%), Sn-117 (52.9%)
Radioactive daughters: In-117
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.4344 [MeV]
Mean photon energy: 0.091 [MeV]
Air kerma rate constant, Γ10: 4.862e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.862e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.960e-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-:
6.960e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.458e-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/In-117m 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-117m 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-117m 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-117m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.12534e-06 |
3.934e+00 |
X-ray |
|
1.08542e-05 |
3.442e-01 |
X-ray |
|
2.39785e-02 |
5.416e-02 |
X-ray |
|
2.41926e-02 |
1.016e-01 |
X-ray |
|
2.52572e-02 |
1.012e-02 |
X-ray |
|
2.72603e-02 |
1.760e-02 |
X-ray |
|
1.58600e-01 |
1.587e-01 |
Gamma |
|
3.15302e-01 |
1.912e-01 |
Gamma |
|
6.09663e-01 |
1.829e-01 |
Beta |
|
6.80251e-01 |
3.458e-01 |
Beta |
|
8.85918e-06 |
1.951e+00 |
Auger electron |
|
1.13302e-05 |
1.702e-01 |
Auger electron |
|
3.03726e-05 |
5.848e-02 |
Auger electron |
|
3.35244e-05 |
6.862e-01 |
Auger electron |
|
1.24032e-04 |
1.884e-02 |
Auger electron |
|
1.25672e-04 |
2.140e-01 |
Auger electron |
|
2.64242e-04 |
3.820e-02 |
Auger electron |
|
3.70900e-04 |
4.821e-01 |
Auger electron |
|
3.96186e-04 |
4.271e-02 |
Auger electron |
|
2.73516e-03 |
1.909e-01 |
Auger electron |
|
2.84745e-03 |
1.687e-02 |
Auger electron |
|
3.21561e-03 |
4.667e-02 |
Auger electron |
|
2.00957e-02 |
2.213e-02 |
Auger electron |
|
1.29416e-01 |
2.179e-02 |
Conversion electron |
|
2.87381e-01 |
2.204e-01 |
Conversion electron |
|
3.11088e-01 |
3.340e-02 |
Conversion electron |
|
3.14641e-01 |
1.011e-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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