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Radionuclide Dosimetric Data Sheets
Arsenic-78
Summary data
General
Classification
Isotope: As-78
Atomic number (Z): 33
Mass number (A): 78
Neutron number (N): 45
Radioactive decay
Decay modes: β-
Half-life: 90.7 [m]
Decay constant: 1.2737e-04 [1/s]
Daughters: Se-78 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.24595 [MeV]
Mean photon energy: 1.30659 [MeV]
Air kerma rate constant, Γ10: 4.516e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.516e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.996e-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-:
1.996e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.093e-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-78 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-78 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-78 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-78 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.58641e-05 |
1.169e-02 |
X-ray |
|
3.54300e-01 |
1.890e-02 |
Gamma |
|
5.45300e-01 |
3.024e-02 |
Gamma |
|
6.13800e-01 |
5.400e-01 |
Gamma |
|
6.94900e-01 |
1.674e-01 |
Gamma |
|
8.28100e-01 |
8.100e-02 |
Gamma |
|
8.42600e-01 |
1.080e-02 |
Gamma |
|
8.88700e-01 |
2.106e-02 |
Gamma |
|
1.07980e+00 |
1.620e-02 |
Gamma |
|
1.14510e+00 |
1.674e-02 |
Gamma |
|
1.24030e+00 |
5.940e-02 |
Gamma |
|
1.30870e+00 |
1.296e-01 |
Gamma |
|
1.37350e+00 |
4.806e-02 |
Gamma |
|
1.53000e+00 |
2.484e-02 |
Gamma |
|
1.71340e+00 |
1.782e-02 |
Gamma |
|
1.83570e+00 |
1.458e-02 |
Gamma |
|
1.99560e+00 |
1.350e-02 |
Gamma |
|
2.68080e+00 |
1.944e-02 |
Gamma |
|
2.41722e-01 |
1.384e-02 |
Beta |
|
3.46680e-01 |
3.437e-02 |
Beta |
|
3.51130e-01 |
1.630e-02 |
Beta |
|
3.87336e-01 |
2.455e-02 |
Beta |
|
5.20665e-01 |
6.284e-02 |
Beta |
|
6.08197e-01 |
1.561e-01 |
Beta |
|
9.71780e-01 |
1.375e-02 |
Beta |
|
1.22935e+00 |
1.434e-01 |
Beta |
|
1.56127e+00 |
1.816e-01 |
Beta |
|
1.85723e+00 |
3.142e-01 |
Beta |
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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