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Radionuclide Dosimetric Data Sheets

Yttrium-84m

Summary data

General

Classification

Isotope:  Y-84m
Atomic number (Z):  39
Mass number (A):  84
Neutron number (N):  45

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  39.5 [m]
Decay constant:  2.9247e-04 [1/s]
Daughters:  Sr-84 (100.0%)
Radioactive daughters:  None

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.22525 [MeV]
Mean photon energy:  3.97508 [MeV]
Air kerma rate constant, Γ10:  1.098e-16 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.451e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.963e-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-:  1.963e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  6.369e-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/Y-84m 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/Y-84m 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/Y-84m 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/Y-84m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

2.09356e-05

7.595e-01

X-ray

1.40549e-02

1.604e-02

X-ray

1.41246e-02

3.081e-02

X-ray

4.62700e-01

9.761e-02

Gamma

5.11000e-01

1.824e+00

Annihilation photon

6.02200e-01

8.775e-02

Gamma

6.60500e-01

1.568e-01

Gamma

6.80400e-01

5.127e-02

Gamma

7.04500e-01

8.480e-02

Gamma

7.93000e-01

9.860e-01

Gamma

9.74100e-01

7.494e-01

Gamma

9.94600e-01

3.845e-02

Gamma

1.00090e+00

2.071e-02

Gamma

1.03980e+00

5.620e-01

Gamma

1.11040e+00

2.859e-02

Gamma

1.11970e+00

1.676e-02

Gamma

1.14390e+00

3.254e-02

Gamma

1.25540e+00

6.606e-02

Gamma

1.26250e+00

3.451e-02

Gamma

1.33010e+00

2.662e-02

Gamma

1.45320e+00

1.380e-02

Gamma

1.50290e+00

5.817e-02

Gamma

1.61700e+00

1.479e-02

Gamma

1.65700e+00

1.972e-02

Gamma

1.74600e+00

3.155e-02

Gamma

1.76400e+00

2.958e-02

Gamma

2.29400e+00

2.465e-02

Gamma

8.40264e-01

8.418e-02

Positron

9.07058e-01

2.405e-02

Positron

9.52612e-01

3.007e-02

Positron

1.09511e+00

1.032e-01

Positron

1.20828e+00

1.433e-01

Positron

1.28948e+00

1.904e-02

Positron

1.42433e+00

1.022e-02

Positron

1.42639e+00

2.606e-01

Positron

1.44495e+00

1.964e-02

Positron

1.46035e+00

4.811e-02

Positron

1.52617e+00

3.207e-02

Positron

1.60855e+00

4.109e-02

Positron

1.79294e+00

3.909e-02

Positron

1.92269e+00

1.002e-02

Positron

2.09294e+00

1.203e-02

Positron

2.40491e+00

3.007e-02

Positron

1.36397e-05

2.117e-01

Auger electron

7.49549e-05

2.111e-01

Auger electron

9.39340e-05

8.966e-02

Auger electron

1.00483e-04

1.921e-02

Auger electron

1.09923e-04

1.023e-02

Auger electron

1.57333e-03

8.831e-02

Auger electron

1.20238e-02

1.834e-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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