tsoon, kus on eelnevalt paika seatud elanikkonna teavitamise ja vastumeetmete rakendamise kiire alustamise meetmed (nt varjumine, joodi manustamine, evakuatsioon), an area around a facility for which emergency arrangements have been made to take urgent protective actions in the event of a nuclear or radiological emergency to avoid or to minimize severe deterministic effects off the site