background. This was considered necessary in the interest 2f saf-ty in that the Radsafe Office could better evaluate the total dose rate to which the aim craft trews were subjected, In order to obtain true (4.e., net) realings, it was 2 simple matter for the Radsafe OF“ICE to analyze a group of successive reported readings and cetermine this infcrmtion by sbservaticn cf rite cf decay cr increase, Hcwever, in the interest of flexibility in the repcrting procedure, a further provision was made for the aireraft crew t. indicate, as necessary, the value they considered aircraft background. (£) Sinee the original plan for cloud tracicing considered the early warning value of the ground monitor stations of the New York Opera tions Office, aEC (NYKOPO), the “off-scale" situation on RONGERIK fcr the GRavO shot dictated the placement of higher range radiac instmments at eritical locations. «$s a consequence, roentgen-range instruments were placed at all the outlying task force weather detachments (:(WURO, KUSAIE, PONAPE and the temporary water-based facility at RONCERIK) to eusent the 100 ar/hr NYKXOPO instruments, In addition, the WsKE Island station, operated by the Weather Bureau for NYKOPO, ws provided with e rcentgen-range instrument and requested to make special reports to the task fcree if end when intensitie: paseed through 10, 50, 100 and 500 or/hr. alsc, the P2V squadron of T 7.3 based on KWAJALEIN was directed tc perform post-shot radsafe surveillance fcr that atoll and report readings dircctly to the ‘ask fsrec headquarters. It was emphasized on C.STLE that ground nonitcr stiticns arc 2 vital part of any successful cloud tracking plain, primerily because of the fact that aircraft surveys can only iniicate the intensities seen by a raciac instrument in the air at some particular altitude, although certain extensions and analysis of the totality of such aerial survey data can reughly indicate whether or act