Half-life
radioactive half-life · t1/2
The time for a radioactive substance to decay to half its initial activity. Drives every aspect of radiopharma manufacturing — calibration time, dispense time, shipping, dosing.
Half-life (t½) governs A(t) = A₀ · e^(−λt), where λ = ln(2) / t½. Typical PET / SPECT isotopes range from minutes (F-18 ≈ 110 min, Tc-99m ≈ 6 h) to days (I-131 ≈ 8 d, Lu-177 ≈ 6.7 d). For short-lived isotopes the entire production-to-patient window may be only a few hours, which is why radiopharma is the only manufacturing sector that ships product before all release testing is complete (see Conditional Release, 21 CFR 212.70(d)).
V5's isotope master holds the half-life for each nuclide; every dispense, calibration-time, dose-at-arrival and dose-at-administration is calculated and captured in the batch record.
Free trial, no credit card, onboard in days, not months.