Nuclide reference
Na-24 — Sodium-24
The half-life of Na-24 is 14.997 h. Main decay mode: β⁻ decay to Mg-24 (100%).
Identification
- Element
- Sodium (Na)
- Atomic number Z
- 11
- Mass number A
- 24
- State
- Radioactive
Key quantities
- Half-life
- 14.997 h
- Specific activity
- 3.222e+17 Bq/g
- Gamma constant Γ (H*(10))
- 0.4909 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 491 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.2 TBq / 0.2 TBq
- D-value (НП-067-24)
- 0.02 TBq
Decay modes
- β⁻ decay → Mg-24 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,368.63 | 99.99 |
| 2,754.01 | 99.86 |
| 3,866.22 | 0.074 |
| 996.6 | 0.0021 |
| 4,238.9 | 0.00084 |
| 2,871 | 0.00025 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 1,392.6 | 99.86 |
| 280.33 | 0.076 | |
| 4,146.8 | 0.064 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².