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CBRN defense

Protective measures against hazardous materials warfare

  • 13 min read
  • 3 chapters

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Through Contamination

A CBRN incident differs from a hazardous material incident in both scope and intent. CBRN incidents are responded to under the assumption that they are intentional and malicious; evidence preservation and perpetrator apprehension are of greater concern than with hazmat team incidents.

An overpressure system consists of two parts, which is a safe area which as far as possible is sealed from possible contaminated air and an air filtration system which will filter out all possible toxins. Air pumps force clean air through the filters into the safe area such that the air pressure within the safe area will always be higher than that outside of the safe area. This pressure differential means that any flows of air will always be from the safe area to the outside, preventing the ingress of toxins. It is similar to a civilian or medical use of a positive pressure room and positive pressure personnel suits.

Collective protection is used for group protection of personnel in a nuclear, biological or chemical event. Collective protection is an important aspect of fixed site defense. Ideally, it provides a contaminate free environment for people, allowing relief from the continuous wearing of gas masks and other Mission Oriented Protective Posture (MOPP) equipment.

The basic concept applied for collective protection is overpressure and filtration. By filtering the incoming air to the shelter or protected space and maintaining higher internal air pressure than the external pressure, the contaminated external air is prevented from infiltrating the shelter or protected space and results in a toxic free area (TFA) for work and relief from wearing MOPP equipment.

The most critical component of any collective protection area is the air filtration system. The U.S. Army Corps of Engineers has published stringent standards for the construction and performance of this type of equipment.

A 2011 forecast concluded that worldwide government spending on CBRN defense products and services would reach US$8.38 billion that year.

Etymology

In English, the 1990s term CBRN (Chemical, Biological, Radiological, and Nuclear) was created as a replacement for the 1960s–1980s term NBC (Nuclear, Biological, and Chemical), which had previously replaced the earlier 1940s–1950s term ABC (Atomic, Biological, and Chemical). The addition of the R (for Radiological) is a consequence of the "new" threat of a radiological weapon (also known as "dirty bombs"). In the 2000s–2010s, the term CBRNE (Chemical, Biological, Radiological, Nuclear, and Explosive) was introduced as an extension of CBRN, the inclusion of the E (for Explosive) in response to the enhanced (improvised) explosives threat.

In Spanish the term NRBQ (Nuclear, Radiológico, Bacteriológico y Químico) has replaced NBQ.

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