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Radionuclide Dosimetric Data Sheets

Cadmium-117m

Summary data

General

Classification

Isotope:  Cd-117m
Atomic number (Z):  48
Mass number (A):  117
Neutron number (N):  69

Radioactive decay

Decay modes:  β-
Half-life:  3.36 [h]
Decay constant:  5.7304e-05 [1/s]
Daughters:  In-117 (99.0%), In-117m (0.998%)
Radioactive daughters:  In-117, In-117m

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.22788 [MeV]
Mean photon energy:  2.04368 [MeV]
Air kerma rate constant, Γ10:  6.673e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  6.673e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  3.651e-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-:  3.651e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.274e-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/Cd-117m 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/Cd-117m 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/Cd-117m 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/Cd-117m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

8.12534e-06

1.346e-01

X-ray

9.77000e-02

1.048e-02

Gamma

3.66910e-01

3.327e-02

Gamma

4.60940e-01

1.624e-02

Gamma

4.84790e-01

1.022e-02

Gamma

5.64397e-01

1.467e-01

Gamma

6.31800e-01

2.803e-02

Gamma

7.48060e-01

4.454e-02

Gamma

7.62720e-01

1.729e-02

Gamma

8.60410e-01

7.886e-02

Gamma

9.31370e-01

3.642e-02

Gamma

1.02906e+00

1.166e-01

Gamma

1.06598e+00

2.306e-01

Gamma

1.23459e+00

1.100e-01

Gamma

1.33930e+00

2.070e-02

Gamma

1.36554e+00

1.651e-02

Gamma

1.43291e+00

1.344e-01

Gamma

1.99733e+00

2.620e-01

Gamma

2.09640e+00

7.441e-02

Gamma

2.32275e+00

7.860e-02

Gamma

2.41740e+00

1.022e-02

Gamma

6.84165e-02

1.630e-02

Beta

7.22012e-02

3.548e-02

Beta

7.37355e-02

1.343e-02

Beta

9.87133e-02

8.247e-02

Beta

1.77747e-01

7.863e-02

Beta

1.78267e-01

1.966e-01

Beta

2.14758e-01

4.603e-01

Beta

4.43877e-01

2.302e-02

Beta

6.03522e-01

2.302e-02

Beta

7.48448e-01

2.302e-02

Beta

8.85822e-06

6.675e-02

Auger electron

3.35366e-05

2.342e-02

Auger electron

3.70727e-04

1.657e-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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