Nuclide reference
Zr-97 — Zirconium-97
The half-life of Zr-97 is 16.749 h. Main decay mode: β⁻ decay to Nb-97m (95.05%).
Identification
- Element
- Zirconium (Zr)
- Atomic number Z
- 40
- Mass number A
- 97
- State
- Radioactive
Key quantities
- Half-life
- 16.749 h
- Specific activity
- 7.137e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 0.4 TBq / 0.4 TBq
- D-value (НП-067-24)
- 0.04 TBq
Decay modes
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 657.94 (Nb-97) | 105.9 |
| 743.36 (Nb-97m) | 93.18 |
| 507.64 | 5.027 |
| 1,147.97 | 2.616 |
| 355.4 | 2.095 |
| 602.37 | 1.378 |
| 1,024.4 (Nb-97) | 1.176 |
| 254.17 | 1.145 |
| 1,750.24 | 1.089 |
| 1,362.68 | 1.024 |
Includes daughter nuclides in equilibrium: Nb-97m, Nb-97 (yield per decay of Zr-97); the emitting nuclide is in brackets. Equilibrium is reached in about 9.1 h. 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 | 1,915.7 | 87.8 |
| 553.09 | 4.95 | |
| 1,408 | 3.9 | |
| 1,276.8 (Nb-97) | 106.1 |
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.