draft COMMENTS ON SOURCE INFORMATION Fallout Patterns \ steed The source documents ae ane the References portion of this report) OeLAL indicate thefaiaisrate ¢contours for the fallout patterns have been drawn to show the canna (airs in roentgens per hour, three feet above the ground, _ in terms of the one hour after burst reference time. The t™w1.2 aprroximation was used when no actual decay data was available to adjust radiation measure- mants. to the one hour reference time. It is important to recognize the H + 1 hour is used as a reference time, and that only the contours from low yield were complete at one hour after burst. For high yield weapons, fallout over some parts of the vast areas shown did not commence until many hours after burst, Where several fallout patterns were available for a particular event, each has been presented. Hodoegraphs The hodographs were drawn for a constant balloon rise rate of 5,000 ft/hr and are presented because other, more meaningful, information is presented not available. Several hodographs are qjummmg™ for the H plus times indicated by the number at the end of the arrow. This number is in H plus hours. It is recognized that fallout did not necessarily follow the hodographs presented herein. However, a simple comparison of the CASTLE BRAVO hodographs with the actual or modeled fallout patterns will show the merit of their consideration.