—CONFEDPENEIAL~ APPENDIX “B" DRAFT LETTER TQ THE JCAR AND GAC 1, So that it may effectively fulfill its purpose as a demonstration to UN observers of the U,S, accomplishment of a thermonuclear device producing reducing amounts of fallout, the following information with respect to shot PINON of Cperation HARDTACK has been declassified: a. The location and scheduled and actual time of the shot, b. The device to be tested is contained in a cylindrical container about 5 feet in diameter, and 12 feet long which will weigh including the contents, about 8 tons c,. The bomb fraction tracer will be 20 tons of depleted uranium, d, The actual total yield as measured by fireball photography. (Only the predicted range of the yield will be announced in advance of the test.) e, Any information that may be derived from samples of the radioactive cloud, f, Fission yield as determinad by radiochemistry at UCRL, Berkeley. The participants will observe this determination and may actually assist in carrying out the analyses, Appendix "B" ae g -6-