The release of chemical, biological, radiological or nuclear (CBRN) substances or material: guidance for local authorities

Source: GOV.UK

The release of chemical, biological, radiological or nuclear (CBRN) substances or material: guidance for local authorities This guidance is designed to give local authorities the information and advice they need to assist with contingency planning and in their existing roles and responsibilities.

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The definition of 'safe' is not strictly an engineering term; it's a societal term. Does it mean absolutely no loss of life? Does it mean absolutely no contamination with radiation? What exactly does 'safe' mean?

– Henry Petroski -