COMMENTS ON SOURCE INFORMATION Fallout Patterns 1 decd The source documents (indicated tn the References portion of this rerort) indicate the ‘desesrate contours for the fallout patterns have been draxn to show the gamma (dese’rate in roentgens per hour, three feat above the ground, in terms of the one hour after burst reference time. The ye? aprroxima tion was used when no actual decay data was available to adjust radiation meesurements to the one hour reference time. It is important to recognize the E +1 nour is used as a reference time, and that only the ccntoure from low yield were complete at one hour after burst. " For high yield weavens, fallout over some parts of the vast areas shown did not commence until ram hours after burst. Where several fallout patterns were available fcr a particular event, eacn has been presented. Hodographs The hodographs were drawn for a constant vballsan rise rate of 5,000 ft/hr and are presented because other, more meaningful, infermation is presented not available. Several hodogravhs are indzeated for the H plus times indicated by the number at the end of the arrow. This nurber is in H plus hours. It is recognized that fallout did not necesseriiy follow the hodograrhs presented herein. However, a simole comparison of ths CASTL& BRAVO hodograchs with the actual or modeled fallout patterns wili show the merit of their consideration. DOE ARCHIVES oY