Nuclide reference
Pr-144m — Praseodymium-144m
The half-life of Pr-144m is 7.2 min. Main decay mode: isomeric transition to Pr-144 (99.93%).
Identification
- Element
- Praseodymium (Pr)
- Atomic number Z
- 59
- Mass number A
- 144
- State
- Radioactive
Key quantities
- Half-life
- 7.2 min
- Specific activity
- 6.71e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 36.026 · X-ray line | 16.11 |
| 35.55 · X-ray line | 8.759 |
| 59.03 | 0.08178 |
| 696.5 | 0.06965 |
| 1,631.36 | 0.0406 |
| 617.8 | 0.04033 |
| 814.1 | 0.01608 |
| 1,885.3 | 0.0133 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 110.83 | 0.0406 |
| 1,545.9 | 0.0161 | |
| 474.73 | 0.0133 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Reference data vs computed valuesHalf-life, gamma lines and D-value are reference data (ENDF/B-VIII.0, НП-067-24).Gamma constant Γ is H*(10) at 1 m computed from ICRP-107 spectra (NIST µ_en/ρ, ICRP-74 Table A.21) including short-lived progeny in equilibrium (e.g. Cs-137/Ba-137m, Ra-226 series); specific activity uses molar mass M ≈ mass number A.K-series X-ray energies are from NIST SRD 128 (Deslattes et al., 2003): in ENDF/B-VIII.0 they are given to 1 % and shifted by up to 0.7 keV for heavy elements. L-series lines and all yields are ENDF/B-VIII.0.