Article Title: High Altitude Electromagnetic Pulse (HEMP) Effects and Protection
Snippet of Article: "...Electromagnetic shielding provides excellent protection against direct absorption effects (i.e., electromagnetic waves impinging directly onto equipment) of the E1 and E2 phases of HEMP. Various metals and other materials with differing weights, sizes, and costs can provide very high levels of electromagnetic wave attenuation to protect equipment. The material selected ties directly to the level of protection needed and the infrastructure to be protected. Shielding can be incorporated in both new construction and renovations, and for whole structures or within specific areas or rooms, or even individual equipment items.
The most common shielding method uses metal containers and boxes, and is particularly suitable for small equipment. The most common metal employed in shielding is copper. However, other metals can be used such as aluminum or steel. In special instances, more exotic metals, such as ferromagnetic alloy metals, are used, particularly when magnetic effects come into play.
Larger areas or whole buildings may be shielded with metal sheeting, or metal foils and conductive paints can be used. Additionally, emerging technologies such as electrically conductive concretes are increasingly attracting attention. In these cases, cost must be weighed against the desired level of protection. ..."
Source: www.wbdg.org
