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Radionuclide Dosimetric Data Sheets

Tantalum-176

Summary data

General

Classification

Isotope:  Ta-176
Atomic number (Z):  73
Mass number (A):  176
Neutron number (N):  103

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  8.09 [h]
Decay constant:  2.3800e-05 [1/s]
Daughters:  Hf-176 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.08492 [MeV]
Mean photon energy:  2.23217 [MeV]
Air kerma rate constant, Γ10:  7.376e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.410e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.361e-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-:  1.361e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.576e-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/Ta-176 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/Ta-176 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/Ta-176 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/Ta-176 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94127e-05

1.485e+01

X-ray

1.63827e-03

4.494e-02

X-ray

6.98230e-03

1.054e-02

X-ray

7.83282e-03

1.743e-02

X-ray

7.88959e-03

1.538e-01

X-ray

9.03750e-03

1.163e-01

X-ray

9.34358e-03

2.673e-02

X-ray

1.05374e-02

2.115e-02

X-ray

5.47191e-02

2.665e-01

X-ray

5.59237e-02

4.663e-01

X-ray

6.31238e-02

4.964e-02

X-ray

6.33831e-02

9.595e-02

X-ray

6.50467e-02

1.116e-02

X-ray

6.51063e-02

2.161e-02

X-ray

8.83500e-02

1.188e-01

Gamma

2.01840e-01

5.670e-02

Gamma

4.66160e-01

1.112e-02

Gamma

5.07790e-01

1.442e-02

Gamma

5.11000e-01

1.778e-02

Annihilation photon

5.21600e-01

2.430e-02

Gamma

6.11160e-01

1.264e-02

Gamma

6.16790e-01

1.004e-02

Gamma

7.10500e-01

5.400e-02

Gamma

1.02310e+00

2.668e-02

Gamma

1.15741e+00

3.397e-02

Gamma

1.15930e+00

2.473e-01

Gamma

1.19022e+00

4.541e-02

Gamma

1.22295e+00

1.998e-02

Gamma

1.22496e+00

5.670e-02

Gamma

1.25290e+00

3.083e-02

Gamma

1.26878e+00

1.328e-02

Gamma

1.29101e+00

1.328e-02

Gamma

1.34133e+00

3.343e-02

Gamma

1.35752e+00

1.998e-02

Gamma

1.55505e+00

4.001e-02

Gamma

1.58402e+00

5.270e-02

Gamma

1.61618e+00

1.285e-02

Gamma

1.63083e+00

1.771e-02

Gamma

1.63374e+00

2.932e-02

Gamma

1.64345e+00

2.398e-02

Gamma

1.67232e+00

1.188e-02

Gamma

1.67918e+00

1.204e-02

Gamma

1.69655e+00

4.633e-02

Gamma

1.70470e+00

1.399e-02

Gamma

1.72204e+00

3.272e-02

Gamma

1.77456e+00

1.561e-02

Gamma

1.82370e+00

4.504e-02

Gamma

1.86274e+00

3.996e-02

Gamma

2.04487e+00

1.350e-02

Gamma

2.83200e+00

4.347e-02

Gamma

2.92041e+00

2.192e-02

Gamma

1.07924e-05

1.292e+00

Auger electron

2.44611e-05

1.832e+00

Auger electron

1.59839e-04

5.172e+00

Auger electron

2.82826e-04

1.631e-01

Auger electron

3.02803e-04

8.750e-01

Auger electron

6.25630e-04

2.116e-01

Auger electron

1.36471e-03

2.253e+00

Auger electron

1.54320e-03

1.187e-01

Auger electron

6.17658e-03

7.279e-01

Auger electron

7.79674e-03

2.701e-01

Auger electron

9.44714e-03

2.528e-02

Auger electron

2.28680e-02

1.382e-01

Conversion electron

4.45280e-02

2.956e-02

Auger electron

5.31026e-02

1.530e-02

Auger electron

7.71050e-02

1.474e-02

Conversion electron

7.75870e-02

2.093e-01

Conversion electron

7.87917e-02

2.002e-01

Conversion electron

8.62510e-02

1.062e-01

Conversion electron

8.83500e-02

2.877e-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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