<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Indium-118m
Summary data
General
Classification
Isotope: In-118m
Atomic number (Z): 49
Mass number (A): 118
Neutron number (N): 69
Radioactive decay
Decay modes: β-
Half-life: 4.364 [m]
Decay constant: 2.6472e-03 [1/s]
Daughters: Sn-118 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.67081 [MeV]
Mean photon energy: 2.77649 [MeV]
Air kerma rate constant, Γ10: 9.705e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.705e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.075e-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-:
1.075e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.448e-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-118m 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-118m 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-118m 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-118m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.08542e-05 |
1.043e-01 |
X-ray |
|
2.08520e-01 |
2.602e-02 |
Gamma |
|
4.45980e-01 |
5.530e-02 |
Gamma |
|
4.74570e-01 |
2.880e-02 |
Gamma |
|
6.35400e-01 |
1.699e-02 |
Gamma |
|
6.38610e-01 |
1.315e-02 |
Gamma |
|
6.83060e-01 |
5.434e-01 |
Gamma |
|
8.13200e-01 |
3.725e-02 |
Gamma |
|
1.05065e+00 |
8.102e-01 |
Gamma |
|
1.09500e+00 |
1.440e-02 |
Gamma |
|
1.09820e+00 |
1.536e-02 |
Gamma |
|
1.17352e+00 |
1.373e-02 |
Gamma |
|
1.22964e+00 |
9.600e-01 |
Gamma |
|
1.25918e+00 |
3.830e-02 |
Gamma |
|
1.50410e+00 |
1.584e-02 |
Gamma |
|
2.04277e+00 |
3.485e-02 |
Gamma |
|
4.09213e-01 |
1.551e-02 |
Beta |
|
5.86673e-01 |
6.369e-01 |
Beta |
|
7.99250e-01 |
8.731e-02 |
Beta |
|
8.94376e-01 |
2.260e-01 |
Beta |
|
1.13300e-05 |
5.155e-02 |
Auger electron |
|
3.03736e-05 |
1.771e-02 |
Auger electron |
|
3.96165e-04 |
1.295e-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)
<= Return to MIRDspec isotope database
