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Radionuclide Dosimetric Data Sheets
Arsenic-68
Summary data
General
Classification
Isotope: As-68
Atomic number (Z): 33
Mass number (A): 68
Neutron number (N): 35
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 151.6 [s]
Decay constant: 4.5722e-03 [1/s]
Daughters: Ge-68 (100.0%)
Radioactive daughters: Ge-68
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.99847 [MeV]
Mean photon energy: 3.71125 [MeV]
Air kerma rate constant, Γ10: 9.075e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.290e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.202e-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-:
3.202e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.946e-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/As-68 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-68 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-68 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-68 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.21072e-05 |
1.073e-01 |
X-ray |
|
5.11000e-01 |
1.977e+00 |
Annihilation photon |
|
6.12000e-01 |
9.688e-02 |
Gamma |
|
6.51200e-01 |
3.193e-01 |
Gamma |
|
7.38400e-01 |
3.022e-02 |
Gamma |
|
7.61800e-01 |
3.356e-01 |
Gamma |
|
9.88300e-01 |
1.008e-02 |
Gamma |
|
1.01610e+00 |
7.750e-01 |
Gamma |
|
1.05270e+00 |
1.783e-02 |
Gamma |
|
1.25240e+00 |
4.495e-02 |
Gamma |
|
1.26340e+00 |
5.115e-02 |
Gamma |
|
1.33280e+00 |
1.162e-02 |
Gamma |
|
1.41330e+00 |
1.519e-01 |
Gamma |
|
1.62250e+00 |
4.185e-02 |
Gamma |
|
1.63320e+00 |
1.008e-02 |
Gamma |
|
1.63990e+00 |
1.705e-02 |
Gamma |
|
1.64590e+00 |
1.008e-02 |
Gamma |
|
1.77810e+00 |
1.999e-01 |
Gamma |
|
1.81470e+00 |
1.395e-02 |
Gamma |
|
2.00740e+00 |
3.565e-02 |
Gamma |
|
2.45760e+00 |
1.008e-02 |
Gamma |
|
2.45880e+00 |
5.038e-02 |
Gamma |
|
2.50620e+00 |
1.395e-02 |
Gamma |
|
2.79340e+00 |
1.240e-02 |
Gamma |
|
3.08830e+00 |
1.008e-02 |
Gamma |
|
1.47049e+00 |
1.211e-02 |
Positron |
|
1.60756e+00 |
1.360e-02 |
Positron |
|
1.65767e+00 |
2.660e-02 |
Positron |
|
1.66474e+00 |
4.962e-02 |
Positron |
|
1.68021e+00 |
6.252e-02 |
Positron |
|
1.73356e+00 |
1.062e-02 |
Positron |
|
1.82845e+00 |
2.977e-02 |
Positron |
|
1.83783e+00 |
1.508e-01 |
Positron |
|
1.84645e+00 |
3.969e-02 |
Positron |
|
1.93916e+00 |
3.305e-02 |
Positron |
|
2.11975e+00 |
2.382e-02 |
Positron |
|
2.13350e+00 |
3.602e-01 |
Positron |
|
2.21156e+00 |
3.870e-02 |
Positron |
|
2.44989e+00 |
6.947e-02 |
Positron |
|
2.82188e+00 |
4.267e-02 |
Positron |
|
1.41918e-05 |
5.151e-02 |
Auger electron |
|
5.27750e-05 |
1.891e-02 |
Auger electron |
|
1.07870e-03 |
1.535e-02 |
Auger 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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