Master's Tea with Dr. Rethy Chhem


Dr. Rethy K. Chhem joined the International Atomic Energy Agency (of the United Nations) in November 2008. He is currently the Director of the Human Health Division (Nuclear Medicine, Diagnostic Radiology, Medical Radiation Physics and Radio-oncology).

The division conducts hundreds of programmes in developing countries in the fields of radiology, nuclear medicine, medical physics, radio-oncology and nuclear sciences/nutrition. Dr. Chhem also serves on the Steering Committee of the IAEA/WHO joint programme for Cancer Control. He represents the IAEA at UNSCEAR (UN Scientific Committee on the Effects of Atomic Radiation)


The Tembusu (Fagraea fragrans) is a large evergreen tree in the family Gentianaceae. It is native to Southeast Asia. Its trunk is dark brown, with deeply fissured bark, looking somewhat like a bittergourd. It grows in an irregular shape from 10 to 25m high. Its leaves are light green and oval in shape. Its yellowish flowers have a distinct fragrance and the fruits of the tree are bitter tasting red berries, which are eaten by birds and fruit bats.