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Radionuclide Dosimetric Data Sheets

Technetium-95m

Summary data

General

Classification

Isotope:  Tc-95m
Atomic number (Z):  43
Mass number (A):  95
Neutron number (N):  52

Radioactive decay

Decay modes:  β+, Electron capture, Internal transition
Half-life:  61.0 [d]
Decay constant:  1.3152e-07 [1/s]
Daughters:  Tc-95 (3.88%), Mo-95 (96.1%)
Radioactive daughters:  Tc-95

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.01544 [MeV]
Mean photon energy:  0.68874 [MeV]
Air kerma rate constant, Γ10:  3.631e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  3.648e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.474e-15 [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-:  2.474e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.103e-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/Tc-95m 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/Tc-95m 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/Tc-95m 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/Tc-95m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

6.84801e-06

9.991e+00

X-ray

7.87444e-06

3.162e-01

X-ray

2.28400e-03

2.062e-02

X-ray

1.73355e-02

1.899e-01

X-ray

1.74440e-02

3.619e-01

X-ray

1.95554e-02

2.949e-02

X-ray

1.95734e-02

5.740e-02

X-ray

1.99225e-02

1.049e-02

X-ray

2.04117e-01

6.325e-01

Gamma

5.82082e-01

2.996e-01

Gamma

6.16490e-01

1.284e-02

Gamma

7.86198e-01

8.659e-02

Gamma

8.20624e-01

4.712e-02

Gamma

8.35149e-01

2.663e-01

Gamma

1.03926e+00

2.777e-02

Gamma

2.73601e-05

4.627e+00

Auger electron

2.93687e-05

1.385e-01

Auger electron

1.06652e-04

8.801e-01

Auger electron

1.06858e-04

1.965e-01

Auger electron

1.09057e-04

2.928e-02

Auger electron

1.76247e-04

2.108e+00

Auger electron

2.04048e-04

6.995e-02

Auger electron

2.18190e-04

2.020e-02

Auger electron

1.95198e-03

8.394e-01

Auger electron

2.03956e-03

2.693e-02

Auger electron

2.20130e-03

1.189e-01

Auger electron

1.47064e-02

1.448e-01

Auger electron

1.69714e-02

5.362e-02

Auger electron

3.62224e-02

1.724e-02

Conversion electron

1.84152e-01

2.860e-02

Conversion 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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