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Radionuclide Dosimetric Data Sheets

Antimony-122m

Summary data

General

Classification

Isotope:  Sb-122m
Atomic number (Z):  51
Mass number (A):  122
Neutron number (N):  71

Radioactive decay

Decay modes:  Internal transition
Half-life:  4.191 [m]
Decay constant:  2.7565e-03 [1/s]
Daughters:  Sb-122 (100.0%)
Radioactive daughters:  Sb-122

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.09368 [MeV]
Mean photon energy:  0.07073 [MeV]
Air kerma rate constant, Γ10:  7.404e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.404e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.501e-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-:  1.501e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.133e-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/Sb-122m 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/Sb-122m Summary 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/Sb-122m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.22318e-05

2.760e+01

X-ray

3.59265e-03

6.843e-02

X-ray

3.83821e-03

4.413e-02

X-ray

2.60930e-02

2.186e-01

X-ray

2.63486e-02

4.079e-01

X-ray

2.96698e-02

3.719e-02

X-ray

2.97173e-02

7.215e-02

X-ray

3.03709e-02

1.501e-02

X-ray

6.14130e-02

5.749e-01

Gamma

7.60595e-02

1.851e-01

Gamma

1.68876e-05

1.359e+01

Auger electron

2.74570e-05

4.532e+00

Auger electron

1.23689e-04

1.516e+00

Auger electron

2.38145e-04

1.910e-01

Auger electron

4.21805e-04

3.513e+00

Auger electron

5.01987e-04

1.057e-01

Auger electron

2.95381e-03

1.365e+00

Auger electron

3.50612e-03

3.686e-01

Auger electron

4.07760e-03

2.524e-02

Auger electron

2.17007e-02

3.294e-01

Conversion electron

2.17904e-02

7.622e-02

Auger electron

2.19562e-02

4.743e-01

Conversion electron

2.53250e-02

1.880e-01

Conversion electron

2.54497e-02

3.301e-02

Auger electron

2.60867e-02

3.897e-02

Conversion electron

3.09340e-02

3.652e-01

Conversion electron

4.55805e-02

5.076e-01

Conversion electron

5.67393e-02

3.442e-02

Conversion electron

7.13858e-02

4.440e-02

Conversion electron

7.16735e-02

8.825e-02

Conversion electron

7.19290e-02

1.116e-01

Conversion electron

7.52978e-02

5.089e-02

Conversion electron

7.60595e-02

1.076e-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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