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Radionuclide Dosimetric Data Sheets

Tin-129

Summary data

General

Classification

Isotope:  Sn-129
Atomic number (Z):  50
Mass number (A):  129
Neutron number (N):  79

Radioactive decay

Decay modes:  β-
Half-life:  2.23 [m]
Decay constant:  5.1805e-03 [1/s]
Daughters:  Sb-129 (100.0%)
Radioactive daughters:  Sb-129

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.25759 [MeV]
Mean photon energy:  1.00806 [MeV]
Air kerma rate constant, Γ10:  3.638e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  3.638e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.015e-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-:  2.015e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.615e-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/Sn-129 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/Sn-129 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/Sn-129 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/Sn-129 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.22326e-05

8.448e-02

X-ray

2.66100e-01

1.137e-02

Gamma

4.10200e-01

1.575e-02

Gamma

5.79300e-01

2.100e-02

Gamma

6.45200e-01

8.750e-01

Gamma

8.48300e-01

2.100e-02

Gamma

8.58200e-01

1.487e-02

Gamma

9.13500e-01

5.513e-02

Gamma

9.28800e-01

1.925e-02

Gamma

1.11710e+00

2.100e-02

Gamma

1.19700e+00

2.625e-02

Gamma

1.20380e+00

1.487e-02

Gamma

1.25220e+00

4.025e-02

Gamma

1.28190e+00

1.050e-02

Gamma

1.47040e+00

1.487e-02

Gamma

1.50360e+00

1.663e-02

Gamma

1.53590e+00

1.312e-02

Gamma

1.61460e+00

1.312e-02

Gamma

2.10270e+00

1.487e-02

Gamma

4.49060e-01

1.069e-02

Beta

4.65143e-01

1.518e-02

Beta

6.19698e-01

1.069e-02

Beta

6.78972e-01

1.334e-02

Beta

7.14169e-01

4.186e-02

Beta

7.43850e-01

3.208e-02

Beta

8.35010e-01

1.609e-02

Beta

8.67683e-01

2.679e-02

Beta

9.04203e-01

2.139e-02

Beta

1.02794e+00

2.679e-02

Beta

1.29734e+00

3.208e-02

Beta

1.42297e+00

7.237e-01

Beta

1.68944e-05

4.159e-02

Auger electron

2.73696e-05

1.401e-02

Auger electron

4.22404e-04

1.057e-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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