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Radionuclide Dosimetric Data Sheets

Rubidium-78m

Summary data

General

Classification

Isotope:  Rb-78m
Atomic number (Z):  37
Mass number (A):  78
Neutron number (N):  41

Radioactive decay

Decay modes:  β+, Electron capture, Internal transition
Half-life:  5.74 [m]
Decay constant:  2.0126e-03 [1/s]
Daughters:  Rb-78 (10.0%), Kr-78 (90.0%)
Radioactive daughters:  Rb-78

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.49924 [MeV]
Mean photon energy:  3.21486 [MeV]
Air kerma rate constant, Γ10:  7.911e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.127e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.402e-13 [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-:  2.402e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  5.151e-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/Rb-78m 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/Rb-78m 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/Rb-78m 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/Rb-78m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.52787e-05

8.951e-02

X-ray

1.93808e-05

2.508e-01

X-ray

1.26066e-02

1.185e-02

X-ray

4.71000e-02

1.184e-02

Gamma

1.03300e-01

9.028e-02

Gamma

3.41260e-01

1.523e-02

Gamma

4.16770e-01

2.284e-02

Gamma

4.54990e-01

8.100e-01

Gamma

5.11000e-01

1.735e+00

Annihilation photon

6.11370e-01

1.021e-02

Gamma

6.64420e-01

3.831e-01

Gamma

6.92880e-01

1.226e-01

Gamma

7.25060e-01

6.237e-02

Gamma

7.34980e-01

1.482e-02

Gamma

7.53370e-01

3.896e-02

Gamma

8.58330e-01

2.001e-02

Gamma

1.10972e+00

1.312e-01

Gamma

1.14787e+00

7.752e-02

Gamma

1.19933e+00

7.201e-02

Gamma

1.23244e+00

1.328e-02

Gamma

1.26563e+00

1.247e-02

Gamma

1.27017e+00

1.353e-02

Gamma

1.37561e+00

1.223e-02

Gamma

1.52981e+00

1.774e-02

Gamma

1.63028e+00

4.957e-02

Gamma

1.64461e+00

7.096e-02

Gamma

1.79625e+00

1.337e-02

Gamma

1.85255e+00

3.078e-02

Gamma

1.87987e+00

1.385e-02

Gamma

1.94397e+00

6.747e-02

Gamma

1.95291e+00

1.717e-02

Gamma

2.01325e+00

3.143e-02

Gamma

2.11828e+00

1.669e-02

Gamma

2.62686e+00

2.843e-02

Gamma

2.65497e+00

1.166e-02

Gamma

3.31950e+00

2.892e-02

Gamma

1.14485e+00

8.799e-02

Positron

1.16786e+00

3.800e-02

Positron

1.19426e+00

3.310e-02

Positron

1.39969e+00

2.280e-02

Positron

1.43399e+00

4.410e-02

Positron

1.46047e+00

2.730e-02

Positron

1.47611e+00

1.650e-02

Positron

1.51083e+00

1.340e-02

Positron

1.62291e+00

1.240e-01

Positron

1.62975e+00

4.240e-02

Positron

1.66420e+00

2.630e-02

Positron

1.71408e+00

1.360e-02

Positron

1.79067e+00

1.900e-02

Positron

1.79759e+00

3.060e-02

Positron

1.84521e+00

2.130e-02

Positron

2.05069e+00

3.400e-02

Positron

2.11232e+00

1.370e-02

Positron

2.19956e+00

4.800e-02

Positron

2.40259e+00

1.700e-02

Positron

2.41480e+00

1.280e-01

Positron

1.26043e-05

2.623e-02

Auger electron

5.62870e-05

1.096e-01

Auger electron

6.49860e-05

2.631e-02

Auger electron

6.55281e-05

4.311e-02

Auger electron

7.35529e-05

1.061e-02

Auger electron

1.40731e-03

3.830e-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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