Nuclide reference
Am-242 — Americium-242
The half-life of Am-242 is 16.02 h. Main decay mode: β⁻ decay to Cm-242 (82.7%).
Identification
- Element
- Americium (Am)
- Atomic number Z
- 95
- Mass number A
- 242
- State
- Radioactive
Key quantities
- Half-life
- 16.02 h
- Specific activity
- 2.991e+16 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 19.2261 · X-ray line | 8.89 |
| 14.9562 · X-ray line | 7.833 |
| 42.13 | 0.03935 |
| 44.54 | 0.01415 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 622.37 | 45.49 |
| 664.5 | 37.21 |
For β⁻ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
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.