Which term defines a designated area immediately surrounding one or more nuclear weapons and/or systems?

The term that defines a designated area immediately surrounding one or more nuclear weapons and/or systems is the "exclusion area." This concept is crucial in the realm of security and safety protocols surrounding nuclear assets. The exclusion area is established to ensure that unauthorized personnel are kept at a safe distance from the nuclear weapons or systems, thereby minimizing the risk of accidents or security breaches. This area is typically highly regulated with strict access controls to protect sensitive materials and safeguard public safety.

The other terms mentioned may relate to security and safety practices but do not specifically refer to the area surrounding nuclear weapons. The buffer zone generally refers to a space intended to separate or cushion areas to minimize interactions or conflicts. A restricted area is a broad term that could apply to various secured locations but does not specifically denote the proximity to nuclear materials. The security perimeter, while relevant in defense and security contexts, describes the boundary around an area that is secured rather than focusing on the specific nature of the nuclear assets. Thus, the exclusion area is the most accurate term for this specific context.