1. Jones DG, Shrimpton PC.Survey of CT practice in the UK. Part 3: Normalised organ doses calculated using Monte Carlo techniques. Chilton, UK: National Radiological Protection Board,1991 : report no. NRPB-R250
2. Zankl M, Panzer W, Drexler G.The calculation of dose from external photon exposures using reference human phantoms and Monte Carlo methods. Part VI: Organ doses from computed tomographic examinations. Neuherberg, Germany: GSF - Forschungszentrum fur Umwelt und Gesundtheit, Institut fur Strahlenschutz,1991
3. International Commission on Radiological Protection.Recommendations of the International Commission on Radiological Protection. Oxford, UK: Pergamon Press, 1977:ICRPPublication no. 26
4. International Commission on Radiological Protection. 1990recommendations of the International Commission on Radiological Protection.Ann ICRP1991; 21; publication no. 60
5. International Commission on Radiological Protection.2007 recommendations of the International Commission on Radiological Protection.Ann ICRP2007; 37 ; publication no. 103