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Radionuclide Dosimetric Data Sheets

Neodymium-149

Summary data

General

Classification

Isotope:  Nd-149
Atomic number (Z):  60
Mass number (A):  149
Neutron number (N):  89

Radioactive decay

Decay modes:  β-
Half-life:  1.728 [h]
Decay constant:  1.1142e-04 [1/s]
Daughters:  Pm-149 (100.0%)
Radioactive daughters:  Pm-149

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.50422 [MeV]
Mean photon energy:  0.37132 [MeV]
Air kerma rate constant, Γ10:  1.402e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.402e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  8.079e-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-:  8.079e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  5.949e-14 [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/Nd-149 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/Nd-149 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/Nd-149 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/Nd-149 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.48446e-05

4.983e+00

X-ray

5.41729e-03

2.699e-02

X-ray

5.95960e-03

1.776e-02

X-ray

3.81996e-02

9.330e-02

X-ray

3.87671e-02

1.693e-01

X-ray

4.37575e-02

1.685e-02

X-ray

4.38721e-02

3.261e-02

X-ray

5.88830e-02

1.295e-02

Gamma

7.43200e-02

1.114e-02

Gamma

9.70010e-02

1.450e-02

Gamma

1.14314e-01

1.917e-01

Gamma

1.55873e-01

5.931e-02

Gamma

1.88640e-01

1.787e-02

Gamma

1.98928e-01

1.391e-02

Gamma

2.08147e-01

2.546e-02

Gamma

2.11309e-01

2.590e-01

Gamma

2.40220e-01

3.937e-02

Gamma

2.67693e-01

6.035e-02

Gamma

2.70166e-01

1.072e-01

Gamma

3.26554e-01

4.558e-02

Gamma

3.49231e-01

1.375e-02

Gamma

4.23553e-01

7.433e-02

Gamma

4.43551e-01

1.150e-02

Gamma

5.40509e-01

6.579e-02

Gamma

6.54831e-01

7.951e-02

Gamma

3.19439e-01

1.082e-02

Beta

3.55418e-01

1.862e-01

Beta

4.03170e-01

2.096e-01

Beta

4.34512e-01

1.170e-02

Beta

4.61867e-01

3.226e-02

Beta

5.15415e-01

1.706e-01

Beta

5.40558e-01

2.407e-01

Beta

5.50282e-01

2.729e-02

Beta

5.82294e-01

5.848e-02

Beta

1.43706e-05

4.349e-01

Auger electron

8.50995e-05

4.071e-01

Auger electron

1.00595e-04

1.991e+00

Auger electron

1.60241e-04

3.190e-01

Auger electron

4.65524e-04

5.738e-02

Auger electron

7.55792e-04

6.979e-01

Auger electron

9.22117e-04

4.628e-02

Auger electron

4.29717e-03

2.617e-01

Auger electron

5.29625e-03

8.874e-02

Auger electron

1.36640e-02

1.199e-02

Conversion electron

2.29808e-02

2.003e-02

Conversion electron

2.35481e-02

2.703e-02

Conversion electron

2.86531e-02

1.086e-02

Conversion electron

2.91010e-02

3.301e-02

Conversion electron

3.14373e-02

1.698e-02

Auger electron

5.17820e-02

2.135e-02

Conversion electron

6.90950e-02

1.760e-01

Conversion electron

1.06920e-01

2.248e-02

Conversion electron

1.66090e-01

4.151e-02

Conversion electron

1.95001e-01

2.167e-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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