UNIVERSITY OF CALIFORNIA LOS ALAMOS SCIENTIFIC LABORATORY (CONTRACT W-7405-ENG-36) P.O. Box 1663 LOS ALAMOS, NEW MEXICO IN REPLY 19 April 1952 REFER TO: Jo /0%8 7 2. Dre Walter D. Claus Division, Biology and Medicine on n Ue Se Atomic Energy Commission o} mn im «Oo “NOU ~ b ‘ = ° o ts Washington 25, D. Ce 3 = Rg go 8B Fo g @ j= a9 dg i- 3 3 Dear Dr. Clauss: Ss 6 30 2 g wes Zana So far as I am aware a_ final report on the Jangle fall-out studies_ I have, however, examinedthe preliminary report prepared by Shulte and have compared his findings with the predictions of the non-turbulent model for the case of the first 2 |e = SXZ has not yet been written. 5 Wess bh GAS TR oanh O gwxe WS BAe Qs ce befic SmE> aaud 635 Jangle shot. The data are unfortunately very skimpy. Readings of radiation levels were made at several points in the general area of fall-out, but the survey was a long ways from being complete enough to permit a plot of isodese contours. It is consequently difficult to know whether the readings represent levels along the main axis of > Jz the fall-out or levels off to the side. Predictions from the model are conservative except for one experi- oO Zz — wt =e .a re) cM 2 =e jo8 Soak fer sues 52 BE¥C 244 Sas om Distance (OY fy 2m Dit — re Tg Sewoe YO, oF wo sZaxy fees ghog eek saad zoo ome — OA Siva UAAY =O ~~ ~ ~~ (Miles) 18 Lo Measured Dose (Roentgens) 276 2.5 = 115 0.1 = 160 0,28 < . 235 0.02 Predicted Dose (Roentgens) Sle 18. lek 0.31 0.08 The measured dose was eeteelse)e observed radiation rates and the fission fragment decay law (+ The predicted dose was computed from the non-turbulent model with the variable parameters (cloud height, yield, wind velocity, and mean particle size for the shot area soil) NAME: = me REVIEWER (ADO): Nel ra re ASSIt 2.¢ ASSAF 3,CON z wt Fes FF a 3 o Osste ee SINGLE REVIEW AUTHORIZED, 3Y: | DEPARTMENT OF ENERGY DECLASSIFICATION REVIEW mental point at approximately 160 miles from zero. he —_ aed egged to measured values for this shot. The agreement is hardly striking -- just barely order of magnitude. This result is, however, about what could reasonably be expected from the model under the best circumstances. The circumstances for this shot were fairly good -- strong winds, very little shear -- but not ideal. features strongly affect these low cloudse