Nuclide reference
Br-77 — Bromine-77
The half-life of Br-77 is 2.3765 d. Main decay mode: β⁺ decay / electron capture to Se-77 (100%).
Identification
- Element
- Bromine (Br)
- Atomic number Z
- 35
- Mass number A
- 77
- State
- Radioactive
Key quantities
- Half-life
- 2.3765 d
- Specific activity
- 2.64e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 3 TBq
- D-value (НП-067-24)
- 0.2 TBq
Decay modes
- β⁺ decay / electron capture → Se-77 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 11.223 · X-ray line | 30.19 |
| 238.98 | 23.1 |
| 520.69 | 22.41 |
| 11.182 · X-ray line | 15.6 |
| 297.23 | 4.158 |
| 249.77 | 2.98 |
| 578.91 | 2.957 |
| 281.65 | 2.287 |
| 817.79 | 2.079 |
| 755.35 | 1.668 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 343 | 0.74 |
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.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.