The fifth international symposium in the series of Asia-Pacific Symposium on Radiochemistry (APSORC 13) will be held from 22 to 27 September 2013 at Kanazawa, Japan. The first symposium was held in Kumamoto, Japan (1997), and subsequently in Fukuoka, Japan (2001), Beijing, China (2005), and Napa Valley, USA (2009). The symposium is dedicated to providing platform for discussion and information exchange for current and emerging research in all fields of nuclear and radiochemistry and related disciplines and technologies. A special session on the Fukushima issues caused by the Fukushima Daiichi Nuclear Power Plant accident in March, 2011 will be also organized. The APSORC 13 will be co-organized by The Japan Society of Nuclear and Radiochemical Sciences and Kanazawa University. The proceedings will be published in the Journal of Radioanalytical and Nuclear Chemistry. The opening and deadline of the proceedings submission will be announced shortly on this web site.