1. C. D. JENNINGS, M. E. MOUNT, UCRL-52835 Pt. 5, 1983, p. 73.
2. V. T. BOWEN, in Reference Methods for Marine Radioactivity Studies, IAEA No. 118, Vienna, 1970, p. 119.
3. J. H. HARLY, Environmental Measurement Laboratory Procedures Manual, HASL-300, 1981.
4. F. E. BUTLER, Health Phys., 15 (1968) 19.
5. E. HOLM, R. FUKAI, Talanta, 23 (1978) 8353.