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Radionuclide Dosimetric Data Sheets

Krypton-75

Isotope:  Kr-75
Atomic number (Z):  36
Mass number (A):  75
Neutron number (N):  39

Decay modes:  β+, Electron capture
Half-life:  4.29 [m]
Decay constant:  2.6929e-03 [1/s]
Daughters:  Br-75 (100.0%)
Radioactive daughters:  Br-75

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.54302 [MeV]
Mean photon energy:  1.27998 [MeV]
Air kerma rate constant, Γ₁₀:  1.639e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  5.336e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  2.472e-13 [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-:  2.472e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  2.051e-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/Kr-75 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/Kr-75 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/Kr-75 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/Kr-75 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.75887e-05	2.034e+00	X-ray
1.18329e-02	4.534e-02	X-ray
1.18814e-02	8.754e-02	X-ray
1.32502e-02	1.220e-02	X-ray
2.21000e-02	1.762e-02	Gamma
8.84000e-02	3.437e-02	Gamma
1.19600e-01	1.950e-02	Gamma
1.32500e-01	6.700e-01	Gamma
1.53200e-01	8.040e-02	Gamma
1.54500e-01	2.077e-01	Gamma
2.41700e-01	1.414e-02	Gamma
5.11000e-01	1.910e+00	Annihilation photon
7.93100e-01	1.708e-02	Gamma
8.24700e-01	1.005e-02	Gamma
1.34630e+00	1.394e-02	Gamma
1.46950e+00	1.126e-02	Gamma
1.60180e+00	1.809e-02	Gamma
9.74722e-01	3.171e-02	Positron
1.35391e+00	1.541e-02	Positron
1.55291e+00	8.003e-02	Positron
1.65772e+00	3.661e-01	Positron
1.66829e+00	3.931e-01	Positron
1.67444e+00	1.370e-02	Positron
4.38526e-05	9.161e-01	Auger electron
5.76882e-05	3.534e-01	Auger electron
9.03435e-05	6.100e-02	Auger electron
1.32074e-03	3.051e-01	Auger electron
1.41151e-03	1.810e-02	Auger electron
8.66500e-03	1.382e-01	Conversion electron
1.02029e-02	7.253e-02	Auger electron
1.16354e-02	2.219e-02	Auger electron
2.03308e-02	1.445e-02	Conversion electron
7.49650e-02	4.056e-02	Conversion electron
1.19065e-01	2.196e-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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