Nuclide reference
Mn-52m — Manganese-52m
The half-life of Mn-52m is 21.1 min. Main decay mode: β⁺ decay / electron capture to Cr-52 (98.25%).
Identification
- Element
- Manganese (Mn)
- Atomic number Z
- 25
- Mass number A
- 52
- State
- Radioactive
Key quantities
- Half-life
- 21.1 min
- Specific activity
- 6.341e+18 Bq/g
- Gamma constant Γ
- —
- D-value (НП-067-24)
- —
Decay modes
- β⁺ decay / electron capture → Cr-52 — 98.25 %
- isomeric transition → Mn-52 — 1.75 %
Main gamma lines
| Energy, keV | Yield, % |
|---|---|
| 510.999 · annihilation 511 keV | 190 |
| 1,434.06 | 98.25 |
| 377.738 | 1.678 |
| 5.414 · X-ray line | 0.2379 |
| 1,727.53 | 0.2161 |
| 5.404 · X-ray line | 0.1212 |
| 1,530.67 | 0.04618 |
| 1,332.62 | 0.02947 |
| 704.6 | 0.02849 |
| 3,161.8 | 0.02162 |
Lines of the bare nuclide (ENDF/B-VIII.0), without daughter ingrowth.
Alpha and beta particles
| Radiation | Energy, keV | Yield, % |
|---|---|---|
| β⁺, E max | 2,633.2 | 94.81 |
| 905.52 | 0.1611 | |
| 1,102.5 | 0.03734 | |
| 595.15 | 0.01277 |
For β⁺ the endpoint (maximum) energy of the spectrum is given. ENDF/B-VIII.0.
Related calculators
Other isotopes of this element
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.