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Radionuclide Dosimetric Data Sheets
Arsenic-74
Summary data
General
Classification
Isotope: As-74
Atomic number (Z): 33
Mass number (A): 74
Neutron number (N): 41
Radioactive decay
Decay modes: β-, β+, Electron capture
Half-life: 17.77 [d]
Decay constant: 4.5147e-07 [1/s]
Daughters: Ge-74 (66.0%), Se-74 (34.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.26584 [MeV]
Mean photon energy: 0.75823 [MeV]
Air kerma rate constant, Γ10: 1.831e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.956e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.259e-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-:
4.259e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.215e-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-74 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-74 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-74 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-74 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.21072e-05 |
3.094e+00 |
X-ray |
|
9.81159e-03 |
5.170e-02 |
X-ray |
|
9.84420e-03 |
1.003e-01 |
X-ray |
|
1.09420e-02 |
1.306e-02 |
X-ray |
|
5.11000e-01 |
5.813e-01 |
Annihilation photon |
|
5.95830e-01 |
5.940e-01 |
Gamma |
|
6.34780e-01 |
1.535e-01 |
Gamma |
|
2.42793e-01 |
1.538e-01 |
Beta |
|
4.07982e-01 |
2.604e-01 |
Positron |
|
5.30863e-01 |
1.858e-01 |
Beta |
|
7.01054e-01 |
3.005e-02 |
Positron |
|
1.41918e-05 |
1.486e+00 |
Auger electron |
|
5.27726e-05 |
5.456e-01 |
Auger electron |
|
9.17081e-05 |
8.600e-02 |
Auger electron |
|
1.07872e-03 |
4.424e-01 |
Auger electron |
|
1.13600e-03 |
1.100e-02 |
Auger electron |
|
8.52330e-03 |
1.190e-01 |
Auger electron |
|
9.66388e-03 |
3.258e-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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