RESULTS 3.1 Chapter 3 ond DISCUSSION GENERAL Figures 3.1 to 3.6 are plots of gamma rate versus tim: at various distances from ground zarce Exocination of tha figures makes apparent the offact of the shockfront passege tetwaen ground zero and the datector station during the initial-gamca radiietion. Aftar ths passage of tha shock front, the initial€anna rate rosa almost to the sama valuo as it was at the time of datonation. Table 3.1 gumuarizes the gecmacradiation data for the stations used during Shots 1, 3, and 4. The extensive instrumntation originally planned wag not follow:d because of tim unexpected loss of most of tha equipment stored on Tow during Shot 1. Out of a total of 30 low- and 5 high~ sensitivity instruments, only seven of the Corser and two of the latter were salvaged for. suceccding shots. 3.1.1 Shot 1. Figure 3.1 shows initial-gamsa rate versus tina for Station250.11onCharlie. Tha increase in rate from 0.35 to 0.9 second was apparently caused by the cxpanding fireball and the appreach of the shock front tovard the detector station. The shock front arrived at the datoctox station at 0.9 sacond. Tha averages velocity of tka shock front batween ground zaro and tre detector station was computed to ta about 8,000 fi/esc. No further data wre obtained because the station was do Atroyed by missiles at that tims. The special detector systam at Station 220.11 on Charlia was designed to datermino the rate or cunilative exmosure dependence of the crystal Cotacting eloments, as well as to measure the initial-gonsa rate. Rocortsa Obtelizsd shored that the two detector heads did not track. Loiwvar, it wag datermired that this vas rot cus to a rata cr doageva depenurnees ef the erystals, but rather to ecattered yacma radiation entering throuzh the Licht pipa crd striking tha photomultinlior tube in the station vithout a gnisld around the ditector bocd. Since a dencity-four nuutrel Plier was Placad Yatizen the erystels end tho photozultiplier tube to increana ths ranga to 10° r/pr, tie offect of thy coattered redietion anticin? through tra Light pire ves to cultiniy ths dimct effect of gama rediction on bls photemutipliar by cavers) anters of rrunitudae Bacauca of this, Vi record tont off ccele ds-sddately end save no trus irdteatior of tha caus rata. Zor station with tha chiele:d dstaetor head rroviticod a good rosenl, bkeceuge tha lead chfoldins uffeetively attenuated the gacua vedinilon that Teacind tis phototub by a factor of 100, Fisure 3.2 plots ranildesd-gitla vata varsus tinn for Stations 209.12 and 220.63. Tho sroph shows thet at Station 220.22, fallont started to byulld up 19 sinutes after the dstornstion and reacted a cexteea vats of 10° rf/hr. The integrated exposure for thm first 24 hours was 3,735 re Tha 19 -~ aoe ee ee wen ekere ee me erect eee - Pmem tee