1. Lindgren ο Andersson HB, Åsbacken 28, S-44534 Bohus, Sweden (Present address: Technical Environmental Planning, Dept of Sanitary Engineering, Chalmers University of Technology, S-41296 Göteborg, Sweden)
2. Studsvik AB, S-61182 Nyköping, Sweden (Present address: Swedish Environmental Protection Agency, S-17185 Solna, Sweden)
3. Department of Nuclear Chemistry, Chalmers University of Technology, S-41296 Göteborg, Sweden