Nuclide reference
Cm-247 — Curium-247
The half-life of Cm-247 is 15.6 million years. Main decay mode: α decay to Pu-243 (100%).
Identification
- Element
- Curium (Cm)
- Atomic number Z
- 96
- Mass number A
- 247
- State
- Radioactive
Key quantities
- Half-life
- 15.6 million years
- Specific activity
- 3,433,000 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 0.001 TBq
- D-value (НП-067-24)
- 0.001 TBq
Decay modes
- α decay → Pu-243 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 402.4 | 72 |
| 84 (Pu-243) | 23.06 |
| 25.2 (Pu-243) | 8.3 |
| 34 (Pu-243) | 3.5 |
| 278 | 3.4 |
| 287.5 | 2 |
| 103.735 · X-ray line | 1.646 |
| 18.596 (Pu-243) · X-ray line | 1.382 |
| 346 | 1.3 |
| 41.8 (Pu-243) | 0.7639 |
Includes daughter nuclides in equilibrium: Pu-243 (yield per decay of Cm-247); the emitting nuclide is in brackets. Equilibrium is reached in about 35 h.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 4,870 | 71 |
| 5,267 | 13.8 | |
| 5,212 | 5.7 | |
| 4,820 | 4.7 | |
| β⁻, E max | 579.4 (Pu-243) | 59 |
| 495.4 (Pu-243) | 21 | |
| 537.2 (Pu-243) | 8.9 | |
| 470.2 (Pu-243) | 5 |
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.