Z Elem Known Stable Unstable Pred. Gap Nuclear γ (keV) f(γ) (Hz) Kα₁ (keV) f(Kα₁) (Hz) Context 81 Tl 39 2 37 93 54 2614.5 6.32×10^20 72.871 1.76×10^19 ²⁰⁸Tl (Th chain) + XRF 82 Pb 43 4 39 102 59 351.9 / 46.5 8.51×10^19 / 1.12×10^19 74.969 1.81×10^19 ²¹⁴Pb, ²¹⁰Pb; XRF 83 Bi 41 0 … Continue reading Master Isotope Table + γ & Kα (Batch 5: Z = 81–100)