1. World Health Organization. Collaborating centres. (2022). Accessed. July 12, 2022: https://www.who.int/about/collaboration/collaborating-centres.
2. Centers for Disease Control and Prevention. Radiation in healthcare. Imaging procedures. (2022). Accessed: July 12, 2022: https://www.cdc.gov/nceh/features/medical-imaging-procedures/index.html.
3. ARPANSA. What is ionising radiation?. (2022). Accessed. July 12, 2022: https://www.arpansa.gov.au/understanding-radiation/what-is-radiation/ionising-radiation.
4. US EPA. Radiation basics. (2022). Accessed. July 30, 2022: https://www.epa.gov/radiation/radiation-basics.
5. Textbook of Radiographic Positioning and Related Anatomy;Bontrager KL,2014