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Radionuclide Dosimetric Data Sheets

Protactinium-236

Summary data

General

Classification

Isotope:  Pa-236
Atomic number (Z):  91
Mass number (A):  236
Neutron number (N):  145

Radioactive decay

Decay modes:  β-
Half-life:  9.1 [m]
Decay constant:  1.2695e-03 [1/s]
Daughters:  U-236 (100.0%)
Radioactive daughters:  U-236

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.80492 [MeV]
Mean photon energy:  0.91478 [MeV]
Air kerma rate constant, Γ10:  3.870e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  3.870e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.290e-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-:  1.290e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.466e-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/Pa-236 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/Pa-236 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/Pa-236 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/Pa-236 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

7.55124e-05

8.610e+00

X-ray

3.25799e-03

5.260e-02

X-ray

1.34452e-02

1.305e-02

X-ray

1.36268e-02

1.147e-01

X-ray

1.64468e-02

2.405e-02

X-ray

1.73072e-02

1.103e-01

X-ray

2.02658e-02

2.499e-02

X-ray

9.50660e-02

2.616e-02

X-ray

9.89281e-02

4.186e-02

X-ray

5.50600e-01

1.080e-02

Gamma

6.42300e-01

3.700e-01

Gamma

6.87500e-01

9.900e-02

Gamma

9.17000e-01

1.370e-02

Gamma

1.23490e+00

1.090e-02

Gamma

1.28370e+00

1.140e-02

Gamma

1.29160e+00

1.090e-02

Gamma

1.51780e+00

1.250e-02

Gamma

1.55960e+00

2.200e-02

Gamma

1.76270e+00

6.000e-02

Gamma

1.80780e+00

2.240e-02

Gamma

1.92700e+00

1.020e-02

Gamma

1.93410e+00

1.070e-02

Gamma

1.97270e+00

1.020e-02

Gamma

2.04130e+00

1.670e-02

Gamma

2.29241e-01

1.202e-02

Beta

2.53490e-01

2.605e-02

Beta

2.91501e-01

1.804e-02

Beta

2.92192e-01

3.307e-02

Beta

2.94594e-01

2.104e-02

Beta

3.55330e-01

8.216e-02

Beta

4.10352e-01

1.904e-02

Beta

4.32378e-01

5.110e-02

Beta

6.26182e-01

2.204e-02

Beta

6.75291e-01

1.102e-02

Beta

6.83742e-01

2.305e-02

Beta

7.97071e-01

4.709e-01

Beta

1.06113e+00

9.018e-02

Beta

1.07987e+00

1.002e-01

Beta

7.21923e-05

2.318e+00

Auger electron

1.63076e-04

1.480e-02

Auger electron

1.86086e-04

2.271e+00

Auger electron

1.92358e-04

1.303e+00

Auger electron

5.37286e-04

3.330e-01

Auger electron

1.23559e-03

8.748e-02

Auger electron

2.44138e-03

7.502e-01

Auger electron

2.91333e-03

1.410e-01

Auger electron

1.02307e-02

1.898e-01

Auger electron

1.35588e-02

9.652e-02

Auger electron

1.69209e-02

1.156e-02

Auger electron

2.41980e-02

2.580e-01

Conversion electron

2.80600e-02

2.273e-01

Conversion electron

3.54560e-02

1.358e-02

Conversion electron

3.93180e-02

1.127e-02

Conversion electron

4.09524e-02

1.366e-01

Conversion electron

4.52420e-02

4.806e-02

Conversion electron

5.26190e-01

4.506e-02

Conversion electron

5.71390e-01

2.495e-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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