Nuclide reference
Ce-144 — Cerium-144
The half-life of Ce-144 is 284.91 d. Main decay mode: β⁻ decay to Pr-144 (99.05%).
Identification
- Element
- Cerium (Ce)
- Atomic number Z
- 58
- Mass number A
- 144
- State
- Radioactive
Key quantities
- Half-life
- 284.91 d
- Specific activity
- 1.178e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.2 TBq / 0.2 TBq
- D-value (НП-067-24)
- 0.9 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 133.515 | 11.09 |
| 36.026 · X-ray line | 4.3 |
| 35.55 · X-ray line | 2.353 |
| 80.12 | 1.364 |
| 696.51 (Pr-144) | 1.342 |
| 2,185.66 (Pr-144) | 0.6938 |
| 1,489.16 (Pr-144) | 0.2778 |
| 40.98 | 0.2573 |
| 33.568 | 0.1996 |
| 53.395 | 0.09981 |
Includes daughter nuclides in equilibrium: Pr-144 (yield per decay of Ce-144); the emitting nuclide is in brackets. Equilibrium is reached in about 2 h.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 318.7 | 76.5 |
| 185.18 | 19.6 | |
| 238.58 | 3.9 | |
| 2,997.5 (Pr-144) | 97.9 |
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.