Question

An area surrounding the incident in which persons may be exposed to dangerous and life-threatening concentrations of material is called the: select one: initial isolation zone valence zone staging action zone decontamination zone

Answer 1

This is called the initial isolation zone which is a circular zone with a radius equal to the initial isolation distance within which persons may be unprotected to dangerous concentrations upwind of the source and may be unprotected to life threatening concentrations downwind of the source. Regulating distances for a detailed incident involves many inter-reliant variables and should be made only by personnel technically qualified to make such adjustments.