iteVii Sait aN seme ecors _ | | AALS E < but one further evidence of confirmation my be appropriate here. In the : q analytic solution the density distribution of air behind the shock wave : 4 3 plays a fundamental role. It also happens that this same density distri- Eo - bution markedly effects the intensity of gauma rays as a function of tine * : as cbeerved on very large scale weapons, such as MIKE, where a large number = of mean free paths are present for gamm ray absorption. For example, this 2 hydrodynamic effect increases the intensity of gama ray rediation et | 4 ce } 4000 metarsfrom MIKE by a factor of 150. The same density distribution used . E. in the analytic solution was furnished J. Malik, who then used these data n ' | to correct the intensity vs. tine curves in Project 5.3. He reports that ; : . this theoretical hyttrodynamic correction then modifies the gamaa ray inten- 4 sities to the extent that good fission yields are obtained from the gamm= : , ray measurements at fairly long distances, This is a rather crucial test p of the density distribution used in the amalytic solution, partly because : important, the air absorption here amunts to factors e713, the hytrodynamic : correction amounts to. of5, 1% follows from the mathematics that only a E emell error in the density diatribution would result in very large errors E it 1s at long distances vhere the theary is considered least reliable, More | q : c in the corrections for gama ray intensity. While those calculations are only of a very preliminary nature, it is felt that the suecese to date is aignificant. BEST AVAILABLE COPY ~ In. the discussion throughout this report one may be struck by the consistentrecurrence of the term “approach ideal pressures". This has a real perer 2 established. It is the nature of this phenosena that in the perturbations o a . og Fr . ye . . a ye 2 : An eccaas . a, Stes sheet MRa edit ireBeBe _ acai ae m i cy a r a 4 1 * g aaa 3 teu, oO ge ake te ey . a 0 otk “dyes: See gah te at oe , , a 7 , 2 : oa ” w¥ alga o ® at Poe . . . 4 tebe Mite ERR LE aig et 4% 7 _; ; P tw SNL -17: . 1. A frou the simple theory one always loses and never gains on pesk pressure. aah wae 1) Seqaie ® for surface effects, By thearythe basic framework of the blast jattern is one aoe ‘ meaning in the general theory for blast, which has been set up in the theory ~~ s 7