At the Swedish Defence Research Agency (FOI), development of verification techniques for detecting nuclear weapon tests has been a main interest for decades. This work has been, and still is, mainly financed by the Swedish Ministry for Foreign Affairs. The main purpose is to provide national technical expertise for the Swedish authorities that can be used in international work conducted within different regimes covering nuclear weapon issues, and also to contribute to the build-up of these regimes. Today, FOI performs nuclear verification research, development and routine measurements mainly in the field of radionuclide detection (with emphasis on radioactive xenon) and seismology. A large part of the work is integrated with the build-up of the verification regime for the Comprehensive Nuclear-Test-Ban Treaty (CTBT). This report summarizes the activities performed in this research area during 2008 at FOI. The report also contains a brief description of research- and measurement facilities used in this research.