Pharmacopoeia & organisations

Society of Nuclear Medicine and Medical Imaging

http://www.snmmi.org

Radiochemistry Society

http://www.radiochemistry.org

International Isotope Society

http://www.intl-isotope-soc.org

Radioactive Decay Calculator

http://www.hse2.ubc.ca/rad/Calc/calcframe.htm

Rad Pro Calculator

http://www.radprocalculator.com/Conversion.aspx

European Association of Nuclear Medicine

http://www.eanm.org

European Pharmacopoeia

https://www.edqm.eu/en 

British Pharmacopoeia

https://www.pharmacopoeia.com

Rad4med

http://rad4med.be/