Emergency Reference Levels (ERLs) 2 : Quantitative criteria used to plan for the introduction of urgent countermeasures in the event of a nuclear emergency
Cabinet Office, Lexicon of UK Civil Protection: A developing single point of reference for UK Civil Protection Terminology - Version 2.0.1, Emergency Responder Interoperability Lexicon, London, UK 2011. http://www.cabinetoffice.gov.uk/cplexicon, (Emr Mgt - Brit) {545}