tle ay Dt MO A Shot 2 was of such a low level compared to existing background that fall~ out stations on Oboe, Dog, ond Peter did not obtain good records. 3.1.3 Shot 3. No initial-gamma rats data were obtained because of the unexpectedlow yield of Shot 3. Fallout Station 220.12 on Dog provided a good record (sse Figure 3.3). Faliout atarted to build up atout 20 minutes after the detonation and reached a maximum of 24 rfhr. Inte~ grated axposure was 51 r in the first 15 hours. 1.28 for tha pariod H+ 1 to H + 12 hours. The dacay exponent waa 3.1.4 Shot4. Figure 3.4 (Station 220.12 on Dog) shows that the initial-gausna rate first dropped in cagnituds, then increased slowly froma 0.4 to about 1.2 saconds, and than increased relatively rapidly to a value of 7.2 x 10° r/hr, approximately the sams 4a tha original rate at tine of datonations. The slow incroazs appears to be tha combined result of th» expansion of the fireball and tha approach of the shock front toward the datector station. The rapid incivass waa caused by the passage of the shock front through the detector atation. Figure 3.5 (Station 220.06 on Fox) shows the same phrnowena as Figure 3.4. Tho expanding fireball and tha spproach of the shock front cause a slow fnerease in tho caozma rate from 0.7 to 4.48 seconds. Passage of the shock front theough the detector station causes an abrupt Increase to about 4.5 * 10' r/hr, after 7 saconds. original rata at tins of cetonation. This peak is about the sam as the The record obtaingd frou Station 220.07 on George shows en initialgamma spike and ths arrival of the shock front 5.86 seconds later. How ever, the ceflection was too szall to cermit the readout of a tim history of the initial gacca. From Shot 4 data, tha average volocitiss of tha shock Cront batwsen ground zaro and Dog, Fox, and George are computed to ba about 5,100, 3,C00, and 2,600 ft/sec, respactively. Facidusl-genua rate versus tim is plotted in Figuro 3.6 (Station 220.07 on Coorge). Fallont reached a poak valve of 620 r/hr, and the x7 cordsoxposute of the firat 10 hours after detonation was 1,237 r. Ourm- ding tho pocacd U + 2 to H+ 6 mara, tno decay oxgosant vas 1.39, and froa H+ 7 to. H* 10 hores it va3 1.61. Tiuses Piguras rapresont th data en reads 00 sorrection for ulr dene sity has bsen aida. The relative cir cansity for ths Castle events is 0.9. 3-2 DATA CORRELATION 3.2.1Intneratad Sroowr Pita “oycis TotalSxroreéa. The dosegos obtaincsd cy Untegrating thy euvras of Vinjliea g.2 fd 366 nave bien come paced to coface measurersnta mada by the ational Biresu of Standords (235) tyre photographie deriratars on Project 2.1 at tha cata etstion locations (Raferanco 8). The recults ora #ucuerlzed in Table 3.2. Bon cause tho encra rates obtalnid aro valid at a oiffictent mriber of medium distanea stations vem wsrsarr did nob axcend 10'r, it rey be aseumd that tha results are also valid at closecin siations ware the total ex~ news Mer ee en oe ee wee ee ee wt te ee woe em,