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Radionuclide Dosimetric Data Sheets

Tantalum-174

Summary data

General

Classification

Isotope:  Ta-174
Atomic number (Z):  73
Mass number (A):  174
Neutron number (N):  101

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  1.14 [h]
Decay constant:  1.6890e-04 [1/s]
Daughters:  Hf-174 (100.0%)
Radioactive daughters:  Hf-174

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.46704 [MeV]
Mean photon energy:  0.97671 [MeV]
Air kerma rate constant, Γ10:  2.396e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  3.529e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  7.483e-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-:  7.483e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.565e-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-174 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-174 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-174 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-174 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94208e-05

1.425e+01

X-ray

1.63848e-03

4.320e-02

X-ray

6.98230e-03

1.004e-02

X-ray

7.83281e-03

1.661e-02

X-ray

7.88959e-03

1.466e-01

X-ray

9.03751e-03

1.184e-01

X-ray

9.34358e-03

2.547e-02

X-ray

1.05374e-02

2.154e-02

X-ray

5.47191e-02

2.359e-01

X-ray

5.59237e-02

4.127e-01

X-ray

6.31238e-02

4.394e-02

X-ray

6.33831e-02

8.492e-02

X-ray

6.51063e-02

1.913e-02

X-ray

9.10000e-02

1.572e-01

Gamma

2.06500e-01

6.000e-01

Gamma

3.10900e-01

1.248e-02

Gamma

5.11000e-01

5.859e-01

Annihilation photon

7.64790e-01

1.260e-02

Gamma

9.71060e-01

1.092e-02

Gamma

1.15141e+00

1.098e-02

Gamma

1.20592e+00

4.860e-02

Gamma

1.22833e+00

1.440e-02

Gamma

1.25923e+00

2.184e-01

Positron

1.35308e+00

5.956e-02

Positron

1.07696e-05

1.238e+00

Auger electron

2.44609e-05

1.757e+00

Auger electron

1.59886e-04

4.966e+00

Auger electron

2.82322e-04

1.564e-01

Auger electron

3.02848e-04

8.398e-01

Auger electron

6.56707e-04

1.797e-01

Auger electron

1.36518e-03

2.165e+00

Auger electron

1.54383e-03

1.141e-01

Auger electron

6.18342e-03

7.028e-01

Auger electron

7.80335e-03

2.609e-01

Auger electron

9.45336e-03

2.441e-02

Auger electron

2.55180e-02

1.782e-01

Conversion electron

4.45280e-02

2.616e-02

Auger electron

5.31026e-02

1.354e-02

Auger electron

7.97550e-02

1.841e-02

Conversion electron

8.02370e-02

2.414e-01

Conversion electron

8.14417e-02

2.288e-01

Conversion electron

8.89010e-02

1.223e-01

Conversion electron

9.10000e-02

3.315e-02

Conversion electron

1.41018e-01

9.147e-02

Conversion electron

1.95255e-01

1.037e-02

Conversion electron

1.95737e-01

2.275e-02

Conversion electron

1.96942e-01

1.606e-02

Conversion electron

2.04401e-01

1.209e-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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