G for anti-ICBM. e To explore effects in this area would required explosions about as follows: High yield at about 450,000 feet for effects in the D-region. Righ yleld at about 1,500,000 feet for effects in the upper ionospheric region. " | High yield at about 3,500,000 feet to understand effects associated with magnetic containment and disturbances. oe b. Anti-ICeM Effects The kill mechanisms for anti-ICBM systems must be better defined. These include X-rays, neutrons, and possibly thermal and blast effects. While some X-rzy data can be obtained through the use of vacuum pipes underZ ground, the ee ee be limited to low yields.Saoeer One experiment of ee this type is schedule ; . 7 } ‘ Punters =. areata | ; ever, for larger yields and togetgross ettécts under actual environmental conditions as well as to search for unexpected phenomena, it seems impossible to avoid the necessity of high altitude bursts. ¢. At the present time no specific experiment has been designed. Atomic DemoJition Munitions - Of less over-all importance but of considerable interest for atomic demolition purposes and PLOWSHARE (excavation), cratering explosions would be required to measure the throwout and distribution of radioactivities from such underground detonations. In this case experiments can be designed in such a way that the fallout that does occur will be highly localized (for example, to the test site in Nevada}. As part of the PLOWSHARE program two cratering experiments have been designed, one at 500 tons inhard rock at the Nevada Test Site nee -

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