Nuclide reference
Pr-142 — Praseodymium-142
The half-life of Pr-142 is 19.12 h. Main decay mode: β⁻ decay to Nd-142 (99.98%).
Identification
- Element
- Praseodymium (Pr)
- Atomic number Z
- 59
- Mass number A
- 142
- State
- Radioactive
Key quantities
- Half-life
- 19.12 h
- Specific activity
- 4.271e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.4 TBq / 0.4 TBq
- D-value (НП-067-24)
- 1 TBq
Decay modes
- β⁻ decay → Nd-142 — 99.98 %
- electron capture → Ce-142 — 0.0164 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,575.6 | 3.679 |
| 508.8 | 0.02281 |
| 642 | 0.002207 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 2,162.2 | 96.3 |
| 586.6 | 3.7 | |
| 77.8 | 0.023 |
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.