~CONPIDENTEALc, The bomb fraction tracer will be 20 tons of uranium (isotopic composition will remain classified.) ad, The total yield as measured by fireball photography (only the predicted range of yield will be announced in advance of the test.) e. Information derived from analyses of radioactive cioud samples without the use of any classified information, f. Fission yield as determined by radiochsmistry at UCRL, Berkeley. The participants will observe this determination and may actually assist in carrying out the analyses. it is necessary to conceal the “Asotopic composition of the depleted uranium tracer in order to conceal the type and amounts of special nuclear material in the weapon; hence the isotopic composition is classified Secret Restricted Data, STAPF JUDGMENTS 4, The Division of Military Application and the Office of General Counsel concur in the recommendation of this paper, RECOMMENDATION 5. The General Manager recommends that the Atomic Energy Commission: Ba De herming that the declassification of the total yield, the time and location, and the scheduled date of shot PINON of Operation HARDTACK would not result in serious derv.ze to the nation or be prejudicial to the *ePousa 2oicerest of the nation; Be Mo that the total fission yield of that event information that may be derived from samples if waGloactive cloud may he Wit ut uwndie 2isk to the comeceTense snd - 2 -