Final answer:
The boundary designed to restrict public and unauthorized access for safety is the Isolation Perimeter. It is put in place during hazardous incidents to ensure that only qualified individuals can approach the site.
Step-by-step explanation:
The boundary established to prevent access by the public and unauthorized persons is known as the Isolation Perimeter. This term refers to a controlled line that is intended to delimit an area that has been deemed unsafe, such as the site of a chemical spill, radiation leak, or other hazardous situations. By setting up an Isolation Perimeter, authorities restrict access to the affected area to protect the public and ensure that only authorized and equipped personnel can enter the zone for emergency response and recovery operations.
An example can be seen after a nuclear accident where an evacuation zone was established around the plant in areas affected by radioactive fallout, as shown in Figure 11.9.3 (b)