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Radionuclide Dosimetric Data Sheets

Iodine-135

Summary data

General

Classification

Isotope:  I-135
Atomic number (Z):  53
Mass number (A):  135
Neutron number (N):  82

Radioactive decay

Decay modes:  β-
Half-life:  6.57 [h]
Decay constant:  2.9306e-05 [1/s]
Daughters:  Xe-135 (83.4%), Xe-135m (16.6%)
Radioactive daughters:  Xe-135, Xe-135m

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.34652 [MeV]
Mean photon energy:  1.58148 [MeV]
Air kerma rate constant, Γ10:  5.317e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  5.317e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  5.552e-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-:  5.552e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  2.534e-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/I-135 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-135 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-135 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-135 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.66176e-05

8.042e-02

X-ray

2.20502e-01

1.751e-02

Gamma

2.88451e-01

3.100e-02

Gamma

4.17633e-01

3.530e-02

Gamma

5.46557e-01

7.146e-02

Gamma

8.36804e-01

6.687e-02

Gamma

9.72620e-01

1.205e-02

Gamma

1.03876e+00

7.950e-02

Gamma

1.10158e+00

1.607e-02

Gamma

1.12400e+00

3.616e-02

Gamma

1.13151e+00

2.259e-01

Gamma

1.26041e+00

2.870e-01

Gamma

1.45756e+00

8.667e-02

Gamma

1.50279e+00

1.076e-02

Gamma

1.56641e+00

1.291e-02

Gamma

1.67803e+00

9.557e-02

Gamma

1.70646e+00

4.104e-02

Gamma

1.79120e+00

7.720e-02

Gamma

6.67187e-02

1.027e-02

Beta

8.27543e-02

1.386e-02

Beta

1.16021e-01

4.766e-02

Beta

1.23609e-01

7.378e-02

Beta

1.72814e-01

1.585e-02

Beta

1.89979e-01

1.107e-02

Beta

2.18896e-01

7.976e-02

Beta

2.87432e-01

8.774e-02

Beta

3.32761e-01

2.174e-01

Beta

3.78937e-01

7.976e-02

Beta

4.23844e-01

7.478e-02

Beta

5.07732e-01

2.353e-01

Beta

5.63571e-01

1.296e-02

Beta

8.29892e-01

1.894e-02

Beta

2.61529e-05

1.252e-02

Auger electron

3.62369e-05

3.825e-02

Auger electron

5.05036e-04

1.051e-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

 

 

 

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