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Radionuclide Dosimetric Data Sheets

Bromine-75

Summary data

General

Classification

Isotope:  Br-75
Atomic number (Z):  35
Mass number (A):  75
Neutron number (N):  40

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  96.7 [m]
Decay constant:  1.1947e-04 [1/s]
Daughters:  Se-75 (100.0%)
Radioactive daughters:  Se-75

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.52825 [MeV]
Mean photon energy:  1.19805 [MeV]
Air kerma rate constant, Γ10:  2.315e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  5.139e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  8.464e-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-:  8.464e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.919e-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/Br-75 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/Br-75 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/Br-75 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/Br-75 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.58664e-05

2.458e+00

X-ray

1.11378e-02

4.301e-02

X-ray

1.11804e-02

8.319e-02

X-ray

1.24553e-02

1.134e-02

X-ray

1.12100e-01

1.672e-02

Gamma

1.41190e-01

6.600e-02

Gamma

2.86500e-01

8.800e-01

Gamma

2.92850e-01

2.666e-02

Gamma

3.77390e-01

3.934e-02

Gamma

4.27790e-01

4.400e-02

Gamma

4.31750e-01

3.872e-02

Gamma

5.11000e-01

1.459e+00

Annihilation photon

5.72930e-01

1.989e-02

Gamma

6.08900e-01

1.681e-02

Gamma

7.33940e-01

1.540e-02

Gamma

9.12050e-01

1.012e-02

Gamma

9.52100e-01

1.663e-02

Gamma

4.99786e-01

3.395e-02

Positron

5.87046e-01

3.295e-02

Positron

6.21968e-01

1.208e-02

Positron

6.93478e-01

4.892e-02

Positron

7.57767e-01

5.192e-01

Positron

8.89308e-01

3.994e-02

Positron

3.25250e-05

1.133e+00

Auger electron

5.48128e-05

4.216e-01

Auger electron

9.70424e-05

9.543e-02

Auger electron

1.23914e-03

3.516e-01

Auger electron

1.31964e-03

1.672e-02

Auger electron

4.88850e-03

3.869e-02

Conversion electron

9.62662e-03

7.744e-02

Auger electron

1.09573e-02

2.283e-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

 

 

 

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