Hens A Ann capone Project 7.1-17/RS-3 ~ TY Residual Contamination in Crater A sample of crater material was obtained from the drone tank and . gama and beta decay measurements were commenced at H-plus-S-hour. 7 addition to this sample, others were obtained In on X~Ray~plus~six-—day, . These consisted of cores and surface material collected at 100 feet te intervals along a radius from l200 feet in to the dase of the tower, t The specific alpha and beta plus gamma activity as a function of distance material, >} “4 os I: “~ and depth in the grown was obtained and will be compared with the crater This project was even more successful and useful than antici- ‘ aN :& af Project 7.1-17/RS(BA). 4 - Aerial Survey of Ground Contamination Aerial surveys of the crater were made at altitudes from 7000 to fr 1000 feet bezinning at H-plus-l-hour and fram 5000 to 500 feet on % Ray-plus..l-day, A further aerial survey was conducted on X-Ray~plus- you 6-day when the crater could also be surveyed by sroumd monitors, “ 4 analysis of the data is awaiting completion of the decay curves but it IB appears that excellent results were obtained from these surveys. ne” s . was obtained for the variation of these maximm readings as a function of altitude, This method of survey appears very promising for operational purposes and the instruments used appeared satisfactory for this type of work, This project apparently was entirely successful, but flishts at lower altatudes soon after the detomtion seem desirable. = TA.- tr eRe ratTAT EF : . - ’ aw eet ame et ge ENSE 4 baat Set nage ee eee PG we’ w he The maximum readings at each altitude were reproducible, and a smooth curve / . yy Final Xo ot 4 ‘ Tt: pated,