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Radionuclide Dosimetric Data Sheets
Arsenic-71
Summary data
General
Classification
Isotope: As-71
Atomic number (Z): 33
Mass number (A): 71
Neutron number (N): 38
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 65.28 [h]
Decay constant: 2.9495e-06 [1/s]
Daughters: Ge-71 (100.0%)
Radioactive daughters: Ge-71
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.11671 [MeV]
Mean photon energy: 0.5765 [MeV]
Air kerma rate constant, Γ10: 1.200e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.298e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.870e-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-:
1.870e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.237e-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/As-71 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/As-71 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/As-71 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/As-71 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.21072e-05 |
6.941e+00 |
X-ray |
|
9.81159e-03 |
1.157e-01 |
X-ray |
|
9.84420e-03 |
2.245e-01 |
X-ray |
|
1.09376e-02 |
1.495e-02 |
X-ray |
|
1.09420e-02 |
2.921e-02 |
X-ray |
|
1.74954e-01 |
8.200e-01 |
Gamma |
|
3.26785e-01 |
3.034e-02 |
Gamma |
|
4.99876e-01 |
3.624e-02 |
Gamma |
|
5.11000e-01 |
5.668e-01 |
Annihilation photon |
|
1.09549e+00 |
4.084e-02 |
Gamma |
|
3.51962e-01 |
2.797e-01 |
Positron |
|
1.41918e-05 |
3.332e+00 |
Auger electron |
|
5.27742e-05 |
1.224e+00 |
Auger electron |
|
9.16923e-05 |
1.925e-01 |
Auger electron |
|
1.07871e-03 |
9.926e-01 |
Auger electron |
|
1.13596e-03 |
2.468e-02 |
Auger electron |
|
8.52330e-03 |
2.663e-01 |
Auger electron |
|
9.66388e-03 |
7.289e-02 |
Auger electron |
|
1.23710e-02 |
3.164e-02 |
Conversion electron |
|
1.63887e-01 |
6.658e-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
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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