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http://www.srp-uk.org/resources/rules-of-thumb-a-practical-hints/103-rules-of-thumb-and-practical-hints
2. US Department of Health, Education and Welfare (1970) Radiological health handbook. Revised edition, p 458
3. Shleien B (ed) (1992) The Health physics and radiological health handbook.
http://www.epa.gov/radiation/docs/wipp/08-0442-attach-3.pdf
4. EANM (2007) Best practice in nuclear medicine. Part 2. A technologist’s guide.
http://www.schreisupport.com/Schreisupport/EANM%20Guidelines/tech_best_practice2.pdf
5. Bjurman B, Ahlgren L, Mattsson S (1982) Radiation dose to staff handling 99Tcm in hospitals. In: Proceedings of the society for radiological protection: third international symposium. Inverness, Scotland