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2. European Commission. Medical Radiation Exposure of the European Population (Part 1). Radiation Protection Publication no 180. Luxembourg: European Commission, DG TREN; 2014. https://ec.europa.eu/energy/sites/ener/files/documents/RP180.pdf
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4. Contract ENER/17/NUCL/SI2.755660 European Study on Medical, Industrial and Research Applications of Nuclear and Radiation Technology: Final Report. https://ec.europa.eu/energy/sites/ener/files/ec-01-08-_d_-_2018-07-30_-_final_report_for_publication.pdf
5. 1990 NRPB-RCR Patient dose reduction in diagnostic radiology: a report of the Royal College of Radiologists and the National Radiological Protection Board. In Documents of the NRPB. 1.NRPB, Chilton 1990