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Radionuclide Dosimetric Data Sheets

Iodine-132m

Summary data

General

Classification

Isotope:  I-132m
Atomic number (Z):  53
Mass number (A):  132
Neutron number (N):  79

Radioactive decay

Decay modes:  β-, Internal transition
Half-life:  1.387 [h]
Decay constant:  1.3882e-04 [1/s]
Daughters:  I-132 (86.0%), Xe-132 (14.0%)
Radioactive daughters:  I-132

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.16141 [MeV]
Mean photon energy:  0.34034 [MeV]
Air kerma rate constant, Γ10:  1.474e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.474e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.586e-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-:  2.586e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  5.453e-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/I-132m 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/I-132m 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/I-132m 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/I-132m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.52573e-05

1.931e+01

X-ray

1.66170e-05

2.837e-01

X-ray

3.92520e-03

4.018e-02

X-ray

4.21605e-03

3.187e-02

X-ray

4.29209e-03

1.243e-02

X-ray

2.20000e-02

8.447e-02

Gamma

2.83065e-02

6.629e-02

X-ray

2.86096e-02

1.231e-01

X-ray

3.22368e-02

1.145e-02

X-ray

3.22942e-02

2.220e-02

X-ray

9.80000e-02

3.715e-02

Gamma

1.75000e-01

8.820e-02

Gamma

5.99800e-01

1.400e-01

Gamma

6.10000e-01

1.470e-02

Gamma

6.14000e-01

2.520e-02

Gamma

6.67718e-01

1.394e-01

Gamma

7.72600e-01

1.396e-01

Gamma

2.93032e-01

2.791e-02

Beta

5.49840e-01

9.601e-02

Beta

2.60941e-05

4.404e-02

Auger electron

2.74766e-05

2.989e+00

Auger electron

2.90355e-05

9.280e+00

Auger electron

3.62272e-05

1.350e-01

Auger electron

1.24002e-04

1.649e-02

Auger electron

1.26357e-04

1.126e+00

Auger electron

3.39828e-04

3.917e-01

Auger electron

4.79933e-04

2.317e+00

Auger electron

5.04844e-04

3.723e-02

Auger electron

5.86219e-04

1.118e-01

Auger electron

3.26989e-03

8.984e-01

Auger electron

3.32150e-03

1.466e-02

Auger electron

3.91203e-03

2.673e-01

Auger electron

4.58280e-03

1.973e-02

Auger electron

1.68381e-02

5.609e-01

Conversion electron

1.71425e-02

4.739e-02

Conversion electron

1.74455e-02

1.157e-02

Conversion electron

2.11302e-02

1.250e-01

Conversion electron

2.20000e-02

3.069e-02

Conversion electron

2.35598e-02

1.990e-02

Auger electron

6.48360e-02

2.607e-01

Conversion electron

9.28381e-02

2.061e-02

Conversion electron

9.31425e-02

2.079e-01

Conversion electron

9.34455e-02

2.189e-01

Conversion electron

9.71302e-02

9.988e-02

Conversion electron

9.80000e-02

2.238e-02

Conversion electron

1.40444e-01

1.740e-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

 

 

 

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