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Radionuclide Dosimetric Data Sheets
Indium-108m
Summary data
General
Classification
Isotope: In-108m
Atomic number (Z): 49
Mass number (A): 108
Neutron number (N): 59
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 39.6 [m]
Decay constant: 2.9173e-04 [1/s]
Daughters: Cd-108 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.70206 [MeV]
Mean photon energy: 2.76548 [MeV]
Air kerma rate constant, Γ10: 7.033e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.118e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.125e-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-:
1.125e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.431e-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-108m 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-108m 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-108m 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-108m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.71475e-05 |
3.446e+00 |
X-ray |
|
3.12254e-03 |
1.330e-02 |
X-ray |
|
2.29571e-02 |
9.721e-02 |
X-ray |
|
2.31527e-02 |
1.827e-01 |
X-ray |
|
2.60401e-02 |
1.612e-02 |
X-ray |
|
2.60753e-02 |
3.132e-02 |
X-ray |
|
3.11600e-01 |
1.008e-02 |
Gamma |
|
5.11000e-01 |
1.078e+00 |
Annihilation photon |
|
6.32900e-01 |
7.640e-01 |
Gamma |
|
8.75400e-01 |
2.445e-02 |
Gamma |
|
9.68500e-01 |
4.355e-02 |
Gamma |
|
1.08750e+00 |
1.528e-02 |
Gamma |
|
1.52940e+00 |
7.334e-02 |
Gamma |
|
1.60120e+00 |
4.049e-02 |
Gamma |
|
1.73210e+00 |
3.820e-02 |
Gamma |
|
1.85190e+00 |
3.056e-02 |
Gamma |
|
1.98630e+00 |
1.238e-01 |
Gamma |
|
2.04830e+00 |
3.056e-02 |
Gamma |
|
2.22420e+00 |
1.375e-02 |
Gamma |
|
2.41320e+00 |
1.452e-02 |
Gamma |
|
3.04680e+00 |
2.445e-02 |
Gamma |
|
3.17840e+00 |
1.604e-02 |
Gamma |
|
3.45220e+00 |
9.168e-02 |
Gamma |
|
3.68940e+00 |
1.070e-02 |
Gamma |
|
3.81180e+00 |
4.202e-02 |
Gamma |
|
3.82550e+00 |
2.368e-02 |
Gamma |
|
6.61023e-01 |
1.380e-02 |
Positron |
|
6.89119e-01 |
5.413e-02 |
Positron |
|
7.49126e-01 |
1.698e-02 |
Positron |
|
8.03828e-01 |
2.441e-02 |
Positron |
|
8.96185e-01 |
4.776e-02 |
Positron |
|
1.15480e+00 |
3.927e-02 |
Positron |
|
1.60838e+00 |
3.227e-01 |
Positron |
|
3.67760e-05 |
1.217e+00 |
Auger electron |
|
1.28081e-04 |
3.549e-01 |
Auger electron |
|
1.65975e-04 |
7.493e-02 |
Auger electron |
|
3.45347e-04 |
8.494e-01 |
Auger electron |
|
2.61029e-03 |
3.276e-01 |
Auger electron |
|
3.05333e-03 |
7.542e-02 |
Auger electron |
|
1.92752e-02 |
4.314e-02 |
Auger electron |
|
2.24238e-02 |
1.775e-02 |
Auger 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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