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Radionuclide Dosimetric Data Sheets
Scandium-44m
Summary data
General
Classification
Isotope: Sc-44m
Atomic number (Z): 21
Mass number (A): 44
Neutron number (N): 23
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 58.61 [h]
Decay constant: 3.2851e-06 [1/s]
Daughters: Sc-44 (98.8%), Ca-44 (1.2%)
Radioactive daughters: Sc-44
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03278 [MeV]
Mean photon energy: 0.27433 [MeV]
Air kerma rate constant, Γ10: 9.861e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.861e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.252e-15 [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-:
5.252e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.395e-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/Sc-44m 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/Sc-44m Summary 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/Sc-44m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
6.75424e-06 |
9.192e-01 |
X-ray |
|
3.63267e-05 |
4.391e-02 |
X-ray |
|
4.05694e-03 |
1.224e-02 |
X-ray |
|
2.70900e-01 |
8.668e-01 |
Gamma |
|
1.00183e+00 |
1.200e-02 |
Gamma |
|
1.12606e+00 |
1.200e-02 |
Gamma |
|
1.15700e+00 |
1.200e-02 |
Gamma |
|
2.43858e-05 |
4.786e-01 |
Auger electron |
|
4.16821e-05 |
3.957e-02 |
Auger electron |
|
2.85648e-04 |
1.833e-02 |
Auger electron |
|
3.31035e-04 |
1.853e-01 |
Auger electron |
|
3.60876e-03 |
7.229e-02 |
Auger electron |
|
3.99167e-03 |
1.641e-02 |
Auger electron |
|
2.66434e-01 |
1.101e-01 |
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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