Frequency conversion: f [Hz]≈EkeV×2.418×1017f \,[\text{Hz}] \approx E_{\text{keV}} \times 2.418\times10^{17}.
## Master Isotope Table + γ & Kα (Batch 2: Z = 21–40)
| Z | Elem | Known | Stable | Unstable | Pred. | Gap | Nuclear γ (keV) | f(γ) (Hz) | Kα₁ (keV) | f(Kα₁) (Hz) | Context |
|---:|:---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---|
| 21 | Sc | 25 | 1 | 24 | 59 | 34 | 889.3 / 1120.5 | 2.15×10^20 / 2.71×10^20 | 4.090 | 9.89×10^17 | ⁴⁶Sc (activation tracer) + XRF |
| 22 | Ti | 26 | 5 | 21 | 62 | 36 | 1157.0 | 2.80×10^20 | 4.511 | 1.09×10^18 | ⁴⁴Ti (via ⁴⁴Sc γ) + XRF |
| 23 | V | 26 | 1 | 25 | 62 | 36 | 983.5 | 2.38×10^20 | 4.952 | 1.20×10^18 | ⁴⁸V (PET/activation) + XRF |
| 24 | Cr | 26 | 4 | 22 | 62 | 36 | 320.1 | 7.73×10^19 | 5.415 | 1.31×10^18 | ⁵¹Cr tracer + XRF |
| 25 | Mn | 26 | 1 | 25 | 62 | 36 | 834.8 | 2.02×10^20 | 5.899 | 1.43×10^18 | ⁵⁴Mn industrial + XRF |
| 26 | Fe | 28 | 4 | 24 | 66 | 38 | — | — | 6.404 | 1.55×10^18 | Fe Kα₁ (ubiquitous XRF) |
| 27 | Co | 29 | 1 | 28 | 69 | 40 | 1173.2 / 1332.5 | 2.84×10^20 / 3.22×10^20 | 6.930 | 1.68×10^18 | ⁶⁰Co γ pair + XRF |
| 28 | Ni | 31 | 5 | 26 | 74 | 43 | — | — | 7.478 | 1.81×10^18 | XRF Kα₁ |
| 29 | Cu | 29 | 2 | 27 | 69 | 40 | — | — | 8.048 | 1.95×10^18 | Cu Kα₁ (calibration) |
| 30 | Zn | 30 | 5 | 25 | 71 | 41 | 1115.5 | 2.70×10^20 | 8.638 | 2.09×10^18 | ⁶⁵Zn + XRF |
| 31 | Ga | 31 | 2 | 29 | 74 | 43 | 93.3 / 184.6 / 300.2 | 2.26×10^19 / 4.46×10^19 / 7.26×10^19 | 9.251 | 2.24×10^18 | ⁶⁷Ga SPECT + XRF |
| 32 | Ge | 32 | 5 | 27 | 76 | 44 | — | — | 9.886 | 2.39×10^18 | XRF Kα₁ |
| 33 | As | 33 | 1 | 32 | 78 | 45 | 559.1 / 595.9 | 1.35×10^20 / 1.44×10^20 | 10.543 | 2.55×10^18 | ⁷⁴As + XRF |
| 34 | Se | 30 | 6 | 24 | 71 | 41 | 136 / 265 / 279.5 | 3.29×10^19 / 6.40×10^19 / 6.76×10^19 | 11.222 | 2.72×10^18 | ⁷⁵Se + XRF |
| 35 | Br | 31 | 2 | 29 | 74 | 43 | 554.3 / 776.5 | 1.34×10^20 / 1.88×10^20 | 11.924 | 2.88×10^18 | ⁸²Br tracer + XRF |
| 36 | Kr | 32 | 6 | 26 | 76 | 44 | 514.0 | 1.24×10^20 | 12.648 | 3.06×10^18 | ⁸⁵Kr (noble gas) + XRF |
| 37 | Rb | 32 | 1 | 31 | 76 | 44 | 511 (annih.) | 1.24×10^20 | 13.395 | 3.24×10^18 | ⁸²Rb PET + XRF |
| 38 | Sr | 34 | 4 | 30 | 81 | 47 | 514.0 | 1.24×10^20 | 14.165 | 3.42×10^18 | ⁸⁵Sr + XRF |
| 39 | Y | 32 | 1 | 31 | 76 | 44 | 898.0 / 1836.0 | 2.17×10^20 / 4.44×10^20 | 14.958 | 3.62×10^18 | ⁸⁸Y calibration + XRF |
| 40 | Zr | 34 | 5 | 29 | 81 | 47 | 724.2 | 1.75×10^20 | 15.775 | 3.81×10^18 | ⁹⁵Zr fission prod. + XRF |
If you like this format, say “Next” and I’ll deliver Batch 3 (Z = 41–60) the same way.