Nuclide reference
Kr-87 — Krypton-87
The half-life of Kr-87 is 1.2717 h. Main decay mode: β⁻ decay to Rb-87 (100%).
Identification
- Element
- Krypton (Kr)
- Atomic number Z
- 36
- Mass number A
- 87
- State
- Radioactive
Key quantities
- Half-life
- 1.2717 h
- Specific activity
- 1.048e+18 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)
- 0.09 TBq
Decay modes
- β⁻ decay → Rb-87 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 402.587 | 49.6 |
| 2,554.8 | 9.226 |
| 845.44 | 7.341 |
| 2,558.1 | 3.918 |
| 2,011.88 | 2.882 |
| 1,740.52 | 2.039 |
| 673.83 | 1.89 |
| 1,175.4 | 1.106 |
| 836.37 | 0.7688 |
| 1,338 | 0.6349 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 3,484.4 | 41 |
| 3,887 | 30.5 | |
| 1,332.2 | 9.4 | |
| 3,041.6 | 7.3 |
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.