The Co-ordinating Group for Environmental Radioactivity (COGER) is a voluntary association of people engaged in scientific research in the field of environmental radioactivity. COGER is a not for profit association whose primary function is to promote and advance, and to disseminate to the public advantage information on and knowledge of the scientific research in the field of environmental radioactivity. COGER aims to provide coordination, exchange and dissemination opportunities within the field of environmental radioactivity, particularly in the UK. This website is one means of achieving this and we would welcome your comments and suggestions for improving this website. We hope you find the information here useful.