Nuclide reference
Na-22 — Sodium-22
The half-life of Na-22 is 2.6027 years. Main decay mode: β⁺ decay / electron capture to Ne-22 (100%).
Identification
- Element
- Sodium (Na)
- Atomic number Z
- 11
- Mass number A
- 22
- State
- Radioactive
Key quantities
- Half-life
- 2.6027 years
- Specific activity
- 2.31e+14 Bq/g
- Gamma constant Γ (H*(10))
- 0.3324 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 332 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.5 TBq / 0.5 TBq
- D-value (НП-067-24)
- 0.03 TBq
Decay modes
- β⁺ decay / electron capture → Ne-22 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 · annihilation 511 keV | 179.9 |
| 1,274.54 | 99.94 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 546.45 | 89.89 |
| 1,821 | 0.055 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².