Nuclide reference
W-188 — Tungsten-188
The half-life of W-188 is 69.78 d. Main decay mode: β⁻ decay to Re-188 (100%).
Identification
- Element
- Tungsten (W)
- Atomic number Z
- 74
- Mass number A
- 188
- State
- Radioactive
Key quantities
- Half-life
- 69.78 d
- Specific activity
- 3.683e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.4 TBq / 0.3 TBq
- D-value (НП-067-24)
- 1 TBq
Decay modes
- β⁻ decay → Re-188 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 155.041 (Re-188) | 15.77 |
| 63 (Re-188) · X-ray line | 2.469 |
| 61.487 (Re-188) · X-ray line | 1.433 |
| 632.983 (Re-188) | 1.388 |
| 477.992 (Re-188) | 1.092 |
| 931.345 (Re-188) | 0.6031 |
| 829.47 (Re-188) | 0.4496 |
| 290.669 | 0.402 |
| 227.09 | 0.2211 |
| 634.98 (Re-188) | 0.1627 |
Includes daughter nuclides in equilibrium: Re-188 (yield per decay of W-188); the emitting nuclide is in brackets. Equilibrium is reached in about 5 d. In transient equilibrium a daughter's activity exceeds the parent's, so a yield can be above 100%.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 349 | 99 |
| 2,120.3 (Re-188) | 70.72 | |
| 1,965.2 (Re-188) | 26.57 | |
| 1,487.3 (Re-188) | 1.766 |
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.