## Master Isotope Table + γ & Kα (Batch 3: Z = 41–60)
| Z | Elem | Known | Stable | Unstable | Pred. | Gap | Nuclear γ (keV) | f(γ) (Hz) | Kα₁ (keV) | f(Kα₁) (Hz) | Context |
|---:|:---:|---:|---:|---:|---:|---:|---:|---:|---:|---:|---|
| 41 | Nb | 34 | 1 | 33 | 81 | 47 | 765.8 | 1.85×10^20 | 16.615 | 4.02×10^18 | ⁹⁵Nb fission product + XRF |
| 42 | Mo | 35 | 7 | 28 | 83 | 48 | 181.1 | 4.38×10^19 | 17.479 | 4.22×10^18 | ⁹⁹Mo → ⁹⁹ᵐTc medical |
| 43 | Tc | 36 | 0 | 36 | 85 | 49 | 140.5 | 3.39×10^19 | 18.367 | 4.44×10^18 | ⁹⁹ᵐTc SPECT |
| 44 | Ru | 37 | 7 | 30 | 88 | 51 | 497.1 | 1.20×10^20 | 19.279 | 4.67×10^18 | ¹⁰³Ru fallout + XRF |
| 45 | Rh | 35 | 1 | 34 | 83 | 48 | — | — | 20.216 | 4.89×10^18 | Stable, XRF Kα₁ |
| 46 | Pd | 36 | 6 | 30 | 85 | 49 | — | — | 21.176 | 5.12×10^18 | Stable, XRF Kα₁ |
| 47 | Ag | 38 | 2 | 36 | 90 | 52 | 657.8 | 1.59×10^20 | 22.163 | 5.36×10^18 | ¹¹⁰ᵐAg environmental tracer |
| 48 | Cd | 39 | 8 | 31 | 93 | 54 | 88.0 | 2.13×10^19 | 23.173 | 5.60×10^18 | ¹⁰⁹Cd calibration source |
| 49 | In | 39 | 2 | 37 | 93 | 54 | 171.3 / 245.4 | 4.14×10^19 / 5.93×10^19 | 24.209 | 5.86×10^18 | ¹¹¹In imaging + XRF |
| 50 | Sn | 40 | 10 | 30 | 95 | 55 | 391.7 | 9.46×10^19 | 25.271 | 6.11×10^18 | ¹¹³Sn tracer + XRF |
| 51 | Sb | 36 | 2 | 34 | 85 | 49 | 602.7 / 1691 | 1.46×10^20 / 4.09×10^20 | 26.359 | 6.37×10^18 | ¹²⁴Sb activation + XRF |
| 52 | Te | 38 | 8 | 30 | 90 | 52 | 159.0 | 3.84×10^19 | 27.472 | 6.64×10^18 | ¹²³ᵐTe, ¹²⁵I precursors + XRF |
| 53 | I | 37 | 1 | 36 | 88 | 51 | 364.5 | 8.81×10^19 | 28.612 | 6.92×10^18 | ¹³¹I medical tracer + XRF |
| 54 | Xe | 40 | 9 | 31 | 95 | 55 | 81.0 | 1.96×10^19 | 29.779 | 7.20×10^18 | ¹³³Xe noble gas tracer |
| 55 | Cs | 39 | 1 | 38 | 93 | 54 | 661.7 | 1.60×10^20 | 30.973 | 7.48×10^18 | ¹³⁷Cs fallout + XRF |
| 56 | Ba | 40 | 7 | 33 | 95 | 55 | 356.0 | 8.61×10^19 | 32.193 | 7.78×10^18 | ¹³³Ba calibration + XRF |
| 57 | La | 39 | 1 | 38 | 93 | 54 | 1596.5 | 3.86×10^20 | 33.442 | 8.08×10^18 | ¹⁴⁰La fission prod. + XRF |
| 58 | Ce | 40 | 4 | 36 | 95 | 55 | 145.4 | 3.52×10^19 | 34.717 | 8.39×10^18 | ¹⁴¹Ce tracer + XRF |
| 59 | Pr | 39 | 1 | 38 | 93 | 54 | — | — | 36.019 | 8.70×10^18 | Stable; XRF Kα₁ |
| 60 | Nd | 41 | 5 | 36 | 97 | 56 | 531.0 | 1.28×10^20 | 37.349 | 9.03×10^18 | ¹⁴⁷Nd tracer + XRF |
If this looks good, say “Next” and I’ll continue with Batch 4 (Z = 61–80).
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