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http://medicalphysicist.co.uk/nrpb_w4.pdf
2. National Radiological Protection Board. Guidance notes for dental practitioners on the safe use of X-ray equipment. Department of Health, June 2001.
http://www.hpa.org.uk/webc/HPAwebFile/HPAweb_C/1194947310610
3. Whaites E. Radiography and radiology for dental care professionals, 2nd ed. Churchill Livingstone, 2009.
4. Colgate Oral and Dental Health Resource Center. X-rays and intraoral pictures. 2003.
http://www.colgate.com/app/CP/US/EN/OC/Information/Articles/Oral-and-Dental-Health-Basics/Checkups-and-Dental-Procedures/X-Rays/article/X-rays-and-Intraoral-Pictures.cvsp
5. NHS Choices. Can I have an X-ray if I'm pregnant? Last reviewed 14 January 2012.
http://www.nhs.uk/chq/Pages/2294.aspx?CategoryID=54&SubCategoryID=130