¹⁰⁵Te — Unstable · t½ ≈ 620 ms · Decay: β⁺ → ¹⁰⁵Sb · Type: synthetic · Uses: research.
¹⁰⁶Te — Unstable · t½ ≈ 70 ms · Decay: β⁺ → ¹⁰⁶Sb · Type: synthetic · Uses: research.
¹⁰⁷Te — Unstable · t½ ≈ 3.5 s · Decay: β⁺ → ¹⁰⁷Sb · Type: synthetic · Uses: research.
¹⁰⁸Te — Unstable · t½ ≈ 2.1 s · Decay: β⁺ → ¹⁰⁸Sb · Type: synthetic · Uses: research.
¹⁰⁹Te — Unstable · t½ ≈ 4.6 s · Decay: β⁺ → ¹⁰⁹Sb · Type: synthetic · Uses: research.
¹¹⁰Te — Unstable · t½ ≈ 18.6 s · Decay: β⁺ → ¹¹⁰Sb · Type: synthetic · Uses: research.
¹¹¹Te — Unstable · t½ ≈ 19.3 s · Decay: β⁺ → ¹¹¹Sb · Type: synthetic · Uses: research.
¹¹²Te — Unstable · t½ ≈ 23.3 s · Decay: β⁺ → ¹¹²Sb · Type: synthetic · Uses: research.
¹¹³Te — Unstable · t½ ≈ 38.0 s · Decay: β⁺ → ¹¹³Sb · Type: synthetic · Uses: research.
¹¹⁴Te — Unstable · t½ ≈ 15.2 s · Decay: β⁺ → ¹¹⁴Sb · Type: synthetic · Uses: research.
¹¹⁵Te — Unstable · t½ ≈ 32.0 s · Decay: β⁺ → ¹¹⁵Sb · Type: synthetic · Uses: research.
¹¹⁶Te — Unstable · t½ ≈ 2.5 h · Decay: β⁺ → ¹¹⁶Sb · Type: activation product · Uses: tracer.
¹¹⁷Te — Unstable · t½ ≈ 1.0 h · Decay: β⁺ → ¹¹⁷Sb · Type: activation product · Uses: tracer.
¹¹⁸Te — Unstable · t½ ≈ 6.0 d · Decay: β⁺ → ¹¹⁸Sb · Type: activation · Uses: tracer.
¹¹⁹Te — Unstable · t½ ≈ 16.0 h · Decay: β⁺ → ¹¹⁹Sb · Type: activation · Uses: tracer.
¹²⁰Te — Stable · — · Type: stable (primordial) · Uses: isotopic tracer.
¹²¹Te — Unstable · t½ ≈ 19.2 d · Decay: β⁻ → ¹²¹Sb · Type: activation product · Uses: tracer.
¹²²Te — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹²³Te — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹²⁴Te — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹²⁵Te — Stable · — · Type: stable (primordial) · Uses: isotope tracer.
¹²⁶Te — Stable · — · Type: stable (primordial, most abundant) · Uses: isotope tracer, double-β decay studies.
¹²⁷Te — Unstable · t½ ≈ 9.4 h · Decay: β⁻ → ¹²⁷I · Type: activation product · Uses: tracer.
¹²⁸Te — Stable · — · Type: stable (primordial, double-β decay candidate) · Uses: neutrino physics.
¹²⁹Te — Unstable · t½ ≈ 70 min · Decay: β⁻ → ¹²⁹I · Type: fission product · Uses: reactor monitoring.
¹³⁰Te — Stable · — · Type: stable (primordial, double-β decay candidate) · Uses: neutrino physics, geochemistry.
¹³¹Te — Unstable · t½ ≈ 25.0 min · Decay: β⁻ → ¹³¹I · Type: fission product · Uses: reactor tracer.
¹³²Te — Unstable · t½ ≈ 3.2 d · Decay: β⁻ → ¹³²I · Type: fission product · Uses: environmental monitoring.
¹³³Te — Unstable · t½ ≈ 12.5 min · Decay: β⁻ → ¹³³I · Type: fission product · Uses: reactor monitoring.
¹³⁴Te — Unstable · t½ ≈ 42.0 min · Decay: β⁻ → ¹³⁴I · Type: fission product · Uses: reactor monitoring.
¹³⁵Te — Unstable · t½ ≈ 19.0 s · Decay: β⁻ → ¹³⁵I · Type: synthetic · Uses: research.
¹³⁶Te — Unstable · t½ ≈ 17.5 s · Decay: β⁻ → ¹³⁶I · Type: synthetic · Uses: research.
¹³⁷Te — Unstable · t½ ≈ 2.5 s · Decay: β⁻ → ¹³⁷I · Type: synthetic · Uses: research.
¹³⁸Te — Unstable · t½ ≈ 1.4 s · Decay: β⁻ → ¹³⁸I · Type: synthetic · Uses: research.
¹³⁹Te — Unstable · t½ ≈ 0.9 s · Decay: β⁻ → ¹³⁹I · Type: synthetic · Uses: research.
¹⁴⁰Te — Unstable · t½ ≈ 0.3 s · Decay: β⁻ → ¹⁴⁰I · Type: synthetic · Uses: research.
¹⁴¹Te — Unstable · t½ ≈ 0.2 s · Decay: β⁻ → ¹⁴¹I · Type: synthetic · Uses: research.
¹⁴²Te — Unstable · t½ ≈ 0.17 s · Decay: β⁻ → ¹⁴²I · Type: synthetic · Uses: research.
¹⁴³Te — Unstable · t½ ≈ 0.09 s · Decay: β⁻ → ¹⁴³I · Type: synthetic · Uses: research.
Tellurium — isotope count: 39 total · Stable: 8 (¹²⁰Te, ¹²²Te, ¹²³Te, ¹²⁴Te, ¹²⁵Te, ¹²⁶Te, ¹²⁸Te, ¹³⁰Te) · Unstable: 31.
(Data: IAEA LiveChart, NUBASE2020, ENSDF; notable applications: ¹²⁸Te, ¹³⁰Te in neutrino physics; ¹³²Te in fallout monitoring; ¹²¹Te, ¹²⁴Te, ¹²⁵Te in environmental tracing.)