Nuclide reference
Cm-243 — Curium-243
The half-life of Cm-243 is 29.1 years. Main decay mode: α decay to Pu-239 (99.71%).
Identification
- Element
- Curium (Cm)
- Atomic number Z
- 96
- Mass number A
- 243
- State
- Radioactive
Key quantities
- Half-life
- 29.1 years
- Specific activity
- 1.871e+12 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 9 TBq / 0.001 TBq
- D-value (НП-067-24)
- 0.2 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 14.2747 · X-ray line | 25.05 |
| 18.0808 · X-ray line | 24.57 |
| 277.599 | 13.96 |
| 228.183 | 10.57 |
| 209.753 | 3.29 |
| 285.46 | 0.7279 |
| 106.125 | 0.3091 |
| 49.412 | 0.1994 |
| 67.841 | 0.1994 |
| 44.663 | 0.1296 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| α | 5,785.2 | 72.99 |
| 5,742.1 | 11.47 | |
| 5,991.8 | 5.683 | |
| 6,058 | 4.686 |
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.