<= Return to MIRDspec isotope database


Radionuclide Dosimetric Data Sheets

Lead-195m

Summary data

General

Classification

Isotope:  Pb-195m
Atomic number (Z):  82
Mass number (A):  195
Neutron number (N):  113

Radioactive decay

Decay modes:  β+, Electron capture
Half-life:  15.0 [m]
Decay constant:  7.7016e-04 [1/s]
Daughters:  Tl-195 (100.0%)
Radioactive daughters:  Tl-195

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.31674 [MeV]
Mean photon energy:  1.6547 [MeV]
Air kerma rate constant, Γ10:  8.355e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  8.827e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  5.075e-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-:  5.075e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  2.651e-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/Pb-195m 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/Pb-195m 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/Pb-195m 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/Pb-195m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

2.07453e-05

2.553e+01

X-ray

2.30440e-03

8.910e-02

X-ray

8.98130e-03

1.480e-02

X-ray

1.01663e-02

2.587e-02

X-ray

1.02661e-02

2.278e-01

X-ray

1.22523e-02

2.212e-01

X-ray

1.22749e-02

4.339e-02

X-ray

1.43397e-02

4.467e-02

X-ray

7.10519e-02

2.515e-01

X-ray

7.31380e-02

4.243e-01

X-ray

8.23884e-02

4.708e-02

X-ray

8.28534e-02

9.113e-02

X-ray

8.50837e-02

1.116e-02

X-ray

8.51979e-02

2.189e-02

X-ray

2.94200e-01

1.012e-02

Gamma

3.13220e-01

6.952e-02

Gamma

3.83640e-01

9.196e-01

Gamma

3.94210e-01

4.400e-01

Gamma

4.28440e-01

4.532e-02

Gamma

5.11000e-01

2.442e-01

Annihilation photon

5.34110e-01

1.760e-02

Gamma

5.39500e-01

1.324e-02

Gamma

6.07640e-01

8.316e-02

Gamma

6.30580e-01

3.256e-02

Gamma

6.30580e-01

3.256e-02

Gamma

6.91170e-01

2.904e-02

Gamma

7.07670e-01

1.404e-01

Gamma

7.34430e-01

1.584e-02

Gamma

7.42190e-01

4.224e-02

Gamma

7.48800e-01

1.496e-02

Gamma

8.01260e-01

2.024e-02

Gamma

8.15310e-01

2.464e-02

Gamma

8.48660e-01

2.948e-02

Gamma

8.78400e-01

2.420e-01

Gamma

8.89900e-01

2.948e-02

Gamma

9.12740e-01

1.553e-02

Gamma

9.28020e-01

3.916e-02

Gamma

9.79070e-01

1.540e-02

Gamma

1.00092e+00

1.377e-02

Gamma

1.06788e+00

6.292e-02

Gamma

1.16160e+00

1.496e-02

Gamma

1.39100e+00

1.232e-02

Gamma

1.92984e+00

1.162e-02

Gamma

1.02185e+00

2.919e-02

Positron

1.09775e+00

1.622e-02

Positron

1.23760e+00

4.000e-02

Positron

4.30602e-05

5.607e+00

Auger electron

7.59256e-05

8.366e+00

Auger electron

1.75045e-04

4.410e+00

Auger electron

4.24662e-04

9.711e-01

Auger electron

1.05709e-03

2.245e-01

Auger electron

1.86495e-03

2.289e+00

Auger electron

2.11328e-03

2.704e-01

Auger electron

2.48683e-03

1.355e-02

Auger electron

7.96604e-03

6.789e-01

Auger electron

1.02633e-02

2.959e-01

Auger electron

1.25901e-02

3.102e-02

Auger electron

5.72241e-02

2.180e-02

Auger electron

6.88063e-02

1.186e-02

Auger electron

8.36400e-02

1.378e-02

Conversion electron

8.42240e-02

4.199e-01

Conversion electron

8.63100e-02

2.976e-01

Conversion electron

9.60254e-02

2.100e-01

Conversion electron

9.89700e-02

6.469e-02

Conversion electron

2.27422e-01

1.886e-02

Conversion electron

2.97842e-01

6.352e-02

Conversion electron

3.08412e-01

6.313e-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

 

 

 

MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)

<= Return to MIRDspec isotope database