Nuclide reference
Xe-135 — Xenon-135
The half-life of Xe-135 is 9.14 h. Main decay mode: β⁻ decay to Cs-135 (100%).
Identification
- Element
- Xenon (Xe)
- Atomic number Z
- 54
- Mass number A
- 135
- State
- Radioactive
Key quantities
- Half-life
- 9.14 h
- Specific activity
- 9.397e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 2 TBq
- D-value (НП-067-24)
- 0.3 TBq
Decay modes
- β⁻ decay → Cs-135 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 249.794 | 90 |
| 608.185 | 2.898 |
| 30.972 · X-ray line | 2.679 |
| 30.625 · X-ray line | 1.45 |
| 407.99 | 0.3582 |
| 158.197 | 0.2889 |
| 358.39 | 0.2205 |
| 812.63 | 0.0702 |
| 731.52 | 0.0549 |
| 654.432 | 0.045 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 915.21 | 96 |
| 556.81 | 3.11 | |
| 757.01 | 0.59 | |
| 102.58 | 0.123 |
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.