Isotope HalfLife Decay PrimaryGammas_keV PrimaryFrequencies_Hz AtmosphericForm Atmosphere_Notes ³H 12.32 y β⁻ (Emax 18.6 keV), no γ H₂O/HTO vapor, water Cosmogenic & reactor; mixes with water; β soft, no penetrating γ ¹⁴C 5,730 y β⁻ (Emax 156 keV), no γ CO₂ (atmosphere), organics Cosmogenic ¹⁴C; used in dating; no primary γ ²²Na 2.602 y β⁺/EC → … Continue reading Isotope → Emission & Atmosphere Mapping (Curated Set)