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Radionuclide Dosimetric Data Sheets

Tantalum-185

Summary data

General

Classification

Isotope:  Ta-185
Atomic number (Z):  73
Mass number (A):  185
Neutron number (N):  112

Radioactive decay

Decay modes:  β-
Half-life:  49.4 [m]
Decay constant:  2.3386e-04 [1/s]
Daughters:  W-185 (100.0%)
Radioactive daughters:  W-185

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.74155 [MeV]
Mean photon energy:  0.15474 [MeV]
Air kerma rate constant, Γ10:  6.408e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  6.408e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.188e-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-:  1.188e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  2.479e-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/Ta-185 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-185 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-185 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-185 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

3.12665e-05

1.094e+01

X-ray

1.77767e-03

4.032e-02

X-ray

8.32492e-03

1.423e-02

X-ray

8.38982e-03

1.255e-01

X-ray

9.69189e-03

1.025e-01

X-ray

9.95867e-03

2.226e-02

X-ray

1.13129e-02

1.908e-02

X-ray

5.81161e-02

1.240e-01

X-ray

5.94830e-02

2.152e-01

X-ray

6.61000e-02

3.855e-02

Gamma

6.71212e-02

2.314e-02

X-ray

6.74178e-02

4.472e-02

X-ray

6.92695e-02

1.021e-02

X-ray

6.97000e-02

2.005e-02

Gamma

1.07800e-01

2.750e-02

Gamma

1.47300e-01

1.182e-02

Gamma

1.73910e-01

2.262e-01

Gamma

1.77590e-01

2.570e-01

Gamma

2.43700e-01

3.752e-02

Gamma

4.15046e-01

1.705e-02

Beta

5.77340e-01

1.906e-02

Beta

6.39476e-01

6.820e-01

Beta

6.69143e-01

2.708e-01

Beta

1.10045e-05

1.266e-01

Conversion electron

2.53515e-05

2.168e+00

Auger electron

1.61491e-04

3.720e+00

Auger electron

3.14923e-04

1.295e-01

Auger electron

3.19623e-04

7.300e-01

Auger electron

7.18718e-04

1.600e-01

Auger electron

1.47354e-03

1.719e+00

Auger electron

1.66004e-03

1.107e-01

Auger electron

6.55741e-03

5.367e-01

Auger electron

8.31550e-03

2.061e-01

Auger electron

1.01034e-02

1.972e-02

Auger electron

1.15230e-02

5.274e-02

Conversion electron

1.20270e-02

2.000e-02

Conversion electron

1.33940e-02

1.905e-02

Conversion electron

2.13288e-02

2.168e-02

Conversion electron

3.09270e-02

3.460e-02

Conversion electron

3.22940e-02

3.868e-02

Conversion electron

3.81110e-02

4.972e-02

Conversion electron

4.02288e-02

1.862e-02

Conversion electron

4.71853e-02

1.301e-02

Auger electron

5.40230e-02

3.904e-02

Conversion electron

5.45270e-02

1.759e-01

Conversion electron

5.58940e-02

1.748e-01

Conversion electron

5.76230e-02

1.851e-02

Conversion electron

6.38288e-02

9.801e-02

Conversion electron

6.61000e-02

2.727e-02

Conversion electron

7.76110e-02

1.152e-02

Conversion electron

9.62270e-02

1.404e-02

Conversion electron

9.75940e-02

1.193e-02

Conversion electron

1.04221e-01

5.547e-02

Conversion electron

1.07901e-01

1.944e-01

Conversion electron

1.62337e-01

2.192e-02

Conversion electron

1.63704e-01

1.603e-02

Conversion electron

1.65513e-01

2.797e-02

Conversion electron

1.71639e-01

1.107e-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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