Nuclide reference
Ca-47 — Calcium-47
The half-life of Ca-47 is 4.536 d. Main decay mode: β⁻ decay to Sc-47 (100%).
Identification
- Element
- Calcium (Ca)
- Atomic number Z
- 20
- Mass number A
- 47
- State
- Radioactive
Key quantities
- Half-life
- 4.536 d
- Specific activity
- 2.266e+16 Bq/g
- Gamma constant Γ
- —
- A1 / A2 for transport (SSR-6, НП-053-16)
- 3 TBq / 0.3 TBq
- D-value (НП-067-24)
- 0.06 TBq
Decay modes
- β⁻ decay → Sc-47 — 100 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 1,297.09 | 67 |
| 489.23 | 5.896 |
| 807.86 | 5.896 |
| 767.1 | 0.1802 |
| 530.6 | 0.08576 |
| 1,878 | 0.02546 |
| 731.6 | 0.01139 |
| 1,146.97 | 0.01139 |
| 41.06 | 0.005561 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁻, E max | 694.88 | 73 |
| 1,992 | 27 | |
| 1,225.2 | 0.087 | |
| 113.8 | 0.037 |
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.