(WT-1621)(EX) EXTRACTED VERSION OPERATION HARDTACK 411003 PROJECT 2.3 - Characteristics of the Radioactive Cloud from Underwater Bursts E. C. Evans III, Project Officer T. H. Shirasawa U.S. Naval Radiological Defense Laboratory San Francisco, California 15 January 1962 NOTICE: This is an extracted version of (WT-1621), OPERATION HARDTACK,Project 2.3. Approved for public release; distribution is unlimited. Extracted version prepared for Director DEFENSE NUCLEAR AGENCY Washington, DC 20305-1000 — 1 September 1985 BEST COPY AVAILABLE