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Radionuclide Dosimetric Data Sheets

Lanthanum-132m

Summary data

General

Classification

Isotope:  La-132m
Atomic number (Z):  57
Mass number (A):  132
Neutron number (N):  75

Radioactive decay

Decay modes:  β+, Electron capture, Internal transition
Half-life:  24.3 [m]
Decay constant:  4.7541e-04 [1/s]
Daughters:  La-132 (76.0%), Ba-132 (24.0%)
Radioactive daughters:  La-132

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.11262 [MeV]
Mean photon energy:  0.67061 [MeV]
Air kerma rate constant, Γ10:  2.378e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  2.626e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  1.804e-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-:  1.804e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  1.074e-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/La-132m 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/La-132m 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/La-132m 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/La-132m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.86002e-05

2.530e+00

X-ray

2.10633e-05

1.167e+01

X-ray

4.63652e-03

4.388e-02

X-ray

5.03753e-03

1.778e-02

X-ray

3.18187e-02

4.172e-02

X-ray

3.22056e-02

7.683e-02

X-ray

3.30405e-02

1.112e-01

X-ray

3.34591e-02

2.042e-01

X-ray

3.63920e-02

1.423e-02

X-ray

3.77381e-02

1.968e-02

X-ray

3.78202e-02

3.812e-02

X-ray

1.35800e-01

4.940e-01

Gamma

2.38300e-01

4.018e-02

Gamma

2.85800e-01

7.366e-02

Gamma

3.90700e-01

4.910e-02

Gamma

4.64550e-01

2.232e-01

Gamma

4.79470e-01

3.125e-02

Gamma

5.11000e-01

1.278e-01

Annihilation photon

5.15000e-01

7.142e-02

Gamma

5.67140e-01

4.464e-02

Gamma

6.01750e-01

1.339e-02

Gamma

6.63070e-01

1.161e-01

Gamma

6.97680e-01

4.018e-02

Gamma

8.99320e-01

6.696e-02

Gamma

9.91000e-01

2.678e-02

Gamma

1.03170e+00

2.678e-02

Gamma

1.04656e+00

5.803e-02

Gamma

6.82173e-01

1.558e-02

Positron

7.02418e-01

3.117e-02

Positron

7.89235e-01

1.714e-02

Positron

1.08630e-05

5.397e-01

Auger electron

1.18532e-05

2.045e+00

Auger electron

3.33700e-05

1.685e-02

Auger electron

4.69839e-05

3.133e-01

Auger electron

4.88198e-05

8.559e-01

Auger electron

6.07501e-05

4.049e+00

Auger electron

6.28202e-05

1.310e+00

Auger electron

1.14466e-04

1.238e-01

Auger electron

1.15887e-04

5.890e-01

Auger electron

3.42350e-04

2.512e-02

Auger electron

3.77271e-04

1.328e-01

Auger electron

5.52284e-04

2.795e-01

Auger electron

5.80094e-04

1.348e+00

Auger electron

6.90646e-04

2.058e-02

Auger electron

7.31576e-04

1.167e-01

Auger electron

3.56925e-03

1.097e-01

Auger electron

3.68528e-03

5.228e-01

Auger electron

4.33578e-03

3.504e-02

Auger electron

4.49927e-03

1.727e-01

Auger electron

5.34553e-03

1.357e-02

Auger electron

1.38570e-02

2.213e-01

Conversion electron

2.63448e-02

1.023e-02

Auger electron

2.73123e-02

2.554e-02

Auger electron

3.21336e-02

1.195e-02

Auger electron

4.65582e-02

1.383e-01

Conversion electron

4.68975e-02

2.015e-02

Conversion electron

4.73162e-02

2.230e-01

Conversion electron

5.16773e-02

9.499e-02

Conversion electron

5.28000e-02

2.568e-02

Conversion electron

9.68570e-02

1.979e-01

Conversion electron

1.29558e-01

2.438e-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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