1. Ionising Radiation Regulations 1999 (SI 1999 No 3232) London, HMSO. - Work with ionizing radiation. Approved code of practice and practical guidance on the Ionising Radiations Regulations 1999, (L121), London HMSO
2. Council Directive 96/29/Euratom of 13th May 1996, laying down basic safety standards for the protection of the health of workers and the general public against the dangers arising form ionising radiation;Off J Eur Commun,1996
3. Council Directive 97/43/Euratom of 30th June 1997, on health protection of individuals against the dangers of ionising radiation in relation to medical exposure Off J Eur Commun 1997 40
4. The 2007 recommendations of the International Commission on Radiological Protection. ICRP Publication 103;ICRP;Ann ICRP,2007a
5. Application of the 2007 recommendations of the ICRP to the UK. Advice from the Health Protection Agency http://webarchive.nationalarchives.gov.uk/20140714084352/ http://www.hpa.org.uk/webc/HPAwebFile/HPAweb_C/1246519364845