Nuclide reference
Sr-82 — Strontium-82
The half-life of Sr-82 is 25.35 d. Main decay mode: electron capture to Rb-82 (100%).
Identification
- Element
- Strontium (Sr)
- Atomic number Z
- 38
- Mass number A
- 82
- State
- Radioactive
Key quantities
- Half-life
- 25.35 d
- Specific activity
- 2.324e+15 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.2 TBq / 0.2 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- electron capture → Rb-82 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 (Rb-82) · annihilation 511 keV | 190.9 |
| 13.395 · X-ray line | 32.79 |
| 13.336 · X-ray line | 17.05 |
| 776.52 (Rb-82) | 15.08 |
| 1,395.14 (Rb-82) | 0.5293 |
| 698.37 (Rb-82) | 0.1493 |
| 1,474.88 (Rb-82) | 0.08898 |
| 696.86 (Rb-82) | 0.07691 |
| 711.2 (Rb-82) | 0.05731 |
| 1,703.19 (Rb-82) | 0.05052 |
Includes daughter nuclides in equilibrium: Rb-82 (yield per decay of Sr-82); the emitting nuclide is in brackets. Equilibrium is reached in about 8.8 min.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 3,380 (Rb-82) | 81.76 |
| 2,603.5 (Rb-82) | 13.13 | |
| 1,208.3 (Rb-82) | 0.32 | |
| 1,905.1 (Rb-82) | 0.121 |
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.