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2. Shrimpton PC, Wall BF, Jones DG et al (1986) Doses to patients from routine diagnostic X-ray examinations in England. Br J Radiol 59:749–758
3. Acr-aapm amended (2014) (resolution 39) ACR–AAPM practice parameter for diagnostic reference levels and achievable doses in medical x-ray imaging. Available via http://www.acr.org/~/media/796DE35AA407447DB81CEB5612B4553D.pdf . Accessed 21 June, 2015
4. The council of the European Union (1997) Council Directive 97/43 of 30 June 1997 on Health protection of individuals against the dangers of ionizing radiation in relation to medical exposure, and repealing directive 84/466/Euratom. Available via: http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:31997L0043:EN:HTML . Accessed 21 June, 2015
5. The council of the European Union (2013) Council Directive 2013/59/Euratom of 5 December 2013 on Laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation, and repealing Directives 89/618/Euratom, 90/641/Euratom, 96/29/Euratom, 97/43/Euratom and 2003/122/Euratom. Available via http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2014:013:0001:0073:EN:PDF . Accessed 21 June, 2015