Nuclide reference
Zn-65 — Zinc-65
The half-life of Zn-65 is 243.93 d. Main decay mode: β⁺ decay / electron capture to Cu-65 (100%).
Identification
- Element
- Zinc (Zn)
- Atomic number Z
- 30
- Mass number A
- 65
- State
- Radioactive
Key quantities
- Half-life
- 243.93 d
- Specific activity
- 3.047e+14 Bq/g
- Gamma constant Γ (H*(10))
- 0.08451 µSv·m²/(MBq·h)
- Dose rate, 1 GBq at 1 m
- ≈ 84.5 µSv/h
- A1 / A2 for transport (SSR-6, НП-053-16)
- 2 TBq / 2 TBq
- D-value (НП-067-24)
- 0.1 TBq
Decay modes
- β⁺ decay / electron capture → Cu-65 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,115.54 | 50.04 |
| 8.048 · X-ray line | 22.74 |
| 8.028 · X-ray line | 11.66 |
| 510.999 · annihilation 511 keV | 2.842 |
| 770.6 | 0.00268 |
| 344.95 | 0.00253 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 330.1 | 1.421 |
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.Dose rate example: point source, no shielding or scatter, Ḣ = Γ·A/r².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.