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Radionuclide Dosimetric Data Sheets
Arsenic-70
Summary data
General
Classification
Isotope: As-70
Atomic number (Z): 33
Mass number (A): 70
Neutron number (N): 37
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 52.6 [m]
Decay constant: 2.1963e-04 [1/s]
Daughters: Ge-70 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.87987 [MeV]
Mean photon energy: 4.25285 [MeV]
Air kerma rate constant, Γ10: 1.138e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.487e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.410e-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-:
1.410e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.814e-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-70 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-70 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-70 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-70 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.21072e-05 |
8.570e-01 |
X-ray |
|
9.81159e-03 |
1.433e-02 |
X-ray |
|
9.84420e-03 |
2.781e-02 |
X-ray |
|
1.75300e-01 |
2.694e-02 |
Gamma |
|
2.52300e-01 |
3.031e-02 |
Gamma |
|
3.73000e-01 |
1.263e-02 |
Gamma |
|
4.92200e-01 |
1.010e-02 |
Gamma |
|
4.97000e-01 |
2.610e-02 |
Gamma |
|
5.11000e-01 |
1.803e+00 |
Annihilation photon |
|
5.95200e-01 |
1.684e-01 |
Gamma |
|
6.07600e-01 |
4.042e-02 |
Gamma |
|
6.15000e-01 |
4.126e-02 |
Gamma |
|
6.68400e-01 |
2.181e-01 |
Gamma |
|
6.86000e-01 |
2.105e-02 |
Gamma |
|
6.96000e-01 |
1.684e-02 |
Gamma |
|
7.44800e-01 |
2.147e-01 |
Gamma |
|
8.89300e-01 |
3.200e-02 |
Gamma |
|
8.93100e-01 |
2.021e-02 |
Gamma |
|
9.01900e-01 |
1.431e-02 |
Gamma |
|
9.05700e-01 |
1.255e-01 |
Gamma |
|
9.42100e-01 |
1.431e-02 |
Gamma |
|
1.04000e+00 |
6.736e-02 |
Gamma |
|
1.04000e+00 |
8.083e-01 |
Gamma |
|
1.09930e+00 |
4.547e-02 |
Gamma |
|
1.11430e+00 |
2.181e-01 |
Gamma |
|
1.11810e+00 |
3.284e-02 |
Gamma |
|
1.18400e+00 |
1.937e-02 |
Gamma |
|
1.25000e+00 |
3.957e-02 |
Gamma |
|
1.33940e+00 |
9.178e-02 |
Gamma |
|
1.41250e+00 |
8.841e-02 |
Gamma |
|
1.49610e+00 |
1.600e-02 |
Gamma |
|
1.52330e+00 |
5.220e-02 |
Gamma |
|
1.70790e+00 |
1.844e-01 |
Gamma |
|
1.78130e+00 |
4.042e-02 |
Gamma |
|
2.00770e+00 |
3.031e-02 |
Gamma |
|
2.02000e+00 |
1.718e-01 |
Gamma |
|
6.64617e-01 |
4.247e-02 |
Positron |
|
7.49982e-01 |
5.037e-02 |
Positron |
|
9.47997e-01 |
3.457e-01 |
Positron |
|
9.53705e-01 |
2.963e-01 |
Positron |
|
1.06565e+00 |
1.778e-02 |
Positron |
|
1.21388e+00 |
1.086e-02 |
Positron |
|
1.23230e+00 |
9.087e-02 |
Positron |
|
1.37327e+00 |
3.556e-02 |
Positron |
|
1.41918e-05 |
4.115e-01 |
Auger electron |
|
5.27737e-05 |
1.511e-01 |
Auger electron |
|
9.16924e-05 |
2.377e-02 |
Auger electron |
|
1.07871e-03 |
1.226e-01 |
Auger electron |
|
8.52330e-03 |
3.298e-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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