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Radionuclide Dosimetric Data Sheets

Palladium-99

Isotope:  Pd-99
Atomic number (Z):  46
Mass number (A):  99
Neutron number (N):  53

Decay modes:  β+, Electron capture
Half-life:  21.4 [m]
Decay constant:  5.3983e-04 [1/s]
Daughters:  Rh-99m (96.6%), Rh-99 (3.35%)
Radioactive daughters:  Rh-99m, Rh-99

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.44984 [MeV]
Mean photon energy:  1.28326 [MeV]
Air kerma rate constant, Γ₁₀:  3.203e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  5.058e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  7.207e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  7.207e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  2.056e-13 [Gy·kg/Bq·s]

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/Pd-99 DPK.csv

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/Pd-99 Summary Spectrum.csv

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/Pd-99 Beta Spectrum.csv

 

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/Pd-99 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
9.95810e-06	5.424e+00	X-ray
2.68654e-03	1.618e-02	X-ray
2.00395e-02	1.298e-01	X-ray
2.01865e-02	2.457e-01	X-ray
2.26708e-02	2.089e-02	X-ray
2.26963e-02	4.062e-02	X-ray
1.36000e-01	7.270e-01	Gamma
2.63600e-01	1.519e-01	Gamma
2.93300e-01	1.309e-02	Gamma
3.86700e-01	2.835e-02	Gamma
3.99800e-01	3.562e-02	Gamma
4.10300e-01	1.309e-02	Gamma
4.27300e-01	1.963e-02	Gamma
5.11000e-01	9.583e-01	Annihilation photon
6.50400e-01	1.309e-02	Gamma
6.52800e-01	1.454e-02	Gamma
6.53100e-01	2.544e-02	Gamma
6.73400e-01	6.907e-02	Gamma
7.86600e-01	3.344e-02	Gamma
8.09800e-01	2.036e-02	Gamma
8.17600e-01	1.090e-02	Gamma
1.01340e+00	1.454e-02	Gamma
1.09960e+00	1.018e-02	Gamma
1.33560e+00	4.653e-02	Gamma
6.52353e-01	1.907e-02	Positron
6.62829e-01	3.111e-02	Positron
8.38100e-01	5.520e-02	Positron
9.58876e-01	3.513e-01	Positron
3.35223e-05	2.146e+00	Auger electron
1.10573e-04	1.204e-01	Auger electron
1.18214e-04	5.237e-01	Auger electron
2.60355e-04	1.283e+00	Auger electron
2.26669e-03	4.963e-01	Auger electron
2.60787e-03	9.204e-02	Auger electron
1.69094e-02	7.473e-02	Auger electron
1.95952e-02	2.925e-02	Auger electron
1.12809e-01	1.005e-01	Conversion electron
1.32609e-01	1.123e-02	Conversion electron

 

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

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

 

 

 

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