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Radionuclide Dosimetric Data Sheets

Tantalum-170

Summary data

General

Classification

Isotope:  Ta-170
Atomic number (Z):  73
Mass number (A):  170
Neutron number (N):  97

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  6.76 [m]
Decay constant:  1.7089e-03 [1/s]
Daughters:  Hf-170 (100.0%)
Radioactive daughters:  Hf-170

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.60492 [MeV]
Mean photon energy:  1.06024 [MeV]
Air kerma rate constant, Γ10:  1.278e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  4.026e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.571e-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-:  2.571e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.699e-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-170 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-170 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-170 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-170 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.94251e-05

8.776e+00

X-ray

1.63877e-03

2.661e-02

X-ray

7.83281e-03

1.007e-02

X-ray

7.88959e-03

8.887e-02

X-ray

9.03751e-03

7.680e-02

X-ray

9.34358e-03

1.544e-02

X-ray

1.05374e-02

1.397e-02

X-ray

5.47191e-02

1.257e-01

X-ray

5.59237e-02

2.200e-01

X-ray

6.31238e-02

2.342e-02

X-ray

6.33831e-02

4.526e-02

X-ray

6.51064e-02

1.020e-02

X-ray

1.00800e-01

2.090e-01

Gamma

2.21200e-01

1.561e-01

Gamma

5.11000e-01

1.420e+00

Annihilation photon

6.65000e-01

1.108e-02

Gamma

8.34800e-01

1.526e-02

Gamma

8.60400e-01

7.357e-02

Gamma

9.87000e-01

3.344e-02

Gamma

9.87000e-01

5.852e-02

Gamma

1.11900e+00

1.108e-02

Gamma

1.34420e+00

1.421e-02

Gamma

1.78834e+00

1.106e-02

Positron

1.82026e+00

2.715e-02

Positron

1.86684e+00

4.626e-02

Positron

1.87875e+00

5.330e-02

Positron

2.17627e+00

9.855e-02

Positron

2.27973e+00

4.425e-01

Positron

1.07504e-05

7.623e-01

Auger electron

2.44607e-05

1.082e+00

Auger electron

1.59930e-04

3.059e+00

Auger electron

2.82100e-04

9.637e-02

Auger electron

3.03180e-04

5.188e-01

Auger electron

6.84762e-04

1.014e-01

Auger electron

1.36573e-03

1.333e+00

Auger electron

1.54472e-03

7.034e-02

Auger electron

6.19341e-03

4.334e-01

Auger electron

7.81350e-03

1.609e-01

Auger electron

9.46366e-03

1.506e-02

Auger electron

3.53180e-02

1.947e-01

Conversion electron

4.45281e-02

1.394e-02

Auger electron

8.95550e-02

1.992e-02

Conversion electron

9.00370e-02

1.998e-01

Conversion electron

9.12417e-02

1.835e-01

Conversion electron

9.87010e-02

1.009e-01

Conversion electron

1.00800e-01

2.736e-02

Conversion electron

1.55718e-01

1.968e-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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