Nuclide reference
Re-184m — Rhenium-184m
The half-life of Re-184m is 169 d. Main decay mode: isomeric transition to Re-184 (74.5%).
Identification
- Element
- Rhenium (Re)
- Atomic number Z
- 75
- Mass number A
- 184
- State
- Radioactive
Key quantities
- Half-life
- 169 d
- Specific activity
- 1.554e+14 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 1 TBq
- D-value (НП-067-24)
- 0.07 TBq
Decay modes
- isomeric transition → Re-184 — 74.5 %
- β⁺ decay / electron capture → W-184 — 25.5 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 59.319 (Re-184) · X-ray line | 41.9 |
| 903.282 (Re-184) | 35.91 |
| 792.067 (Re-184) | 35.51 |
| 61.141 · X-ray line | 24.28 |
| 111.217 (Re-184) | 16.23 |
| 894.76 (Re-184) | 14.8 |
| 104.739 | 13.58 |
| 252.845 | 10.79 |
| 216.547 | 9.526 |
| 920.933 | 8.221 |
Includes daughter nuclides in equilibrium: Re-184 (yield per decay of Re-184m); the emitting nuclide is in brackets. Equilibrium is reached in about 310 d.
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.