Nuclide reference
Am-246m — Americium-246m
The half-life of Am-246m is 25 min. Main decay mode: β⁻ decay to Cm-246 (100%).
Identification
- Element
- Americium (Am)
- Atomic number Z
- 95
- Mass number A
- 246
- State
- Radioactive
Key quantities
- Half-life
- 25 min
- Specific activity
- 1.131e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁻ decay → Cm-246 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,078.86 | 27.78 |
| 798.8 | 24.8 |
| 1,062.04 | 17.14 |
| 19.1993 · X-ray line | 12.94 |
| 1,036 | 12.7 |
| 14.9564 · X-ray line | 11.8 |
| 833.6 | 1.786 |
| 1,085.15 | 1.528 |
| 734.41 | 1.168 |
| 270.07 | 1.022 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,302.1 | 37.3 |
| 1,539.3 | 16.1 | |
| 1,276.1 | 14 | |
| 1,504.6 | 6.9 |
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.