a 3S a o a | AREA OF HEAVY FALLOUT Lo F Dn DISTANCE FROM BURST POINT (statute miles) 150 4 N 50 0 50 100 150 200 250 DISTANCE FROM BURST POINT (statute miles) Figure 90. R/hr CASTLE, YANKEE heavy fallout area. (and increasing) were noted. procedures. The area within the contour would have been a full radex area 24 hours after the shot had the fallout been over dry land (after Reference 81). The LSTs carried out decontamination At 1700, readings averaged 0.020 R/hr with the highest readings on wind-exposed surfaces. at 2000 was 13°16 'N, 177°97'E. (0.040 R/hr maximum), The ships’ position A steady decrease in radiation intensity was noted after 2330, and decontamination continued throughout the night. LST-762 reported a maximum of 0.040 R/hr; LST-975, 0.096 R/hr. By 0800 on 7 May (position 14°30'N, 178°40'E), intensities had dropped to an average of 0.005 R/hr and a maximum of 0.015 R/hr. At 0700 on 8 May at position 15°5'N, 178°44'E, LST-762 indicated an average of 0.003 R/hr and a maximum of 0.008 R/hr; LST-975 reported 0.007 and 0.010 R/hr, respectively. No individual exposures are available for this incident. It is not clear whether the cumulative exposures reported for the crew of LST-762 and reported in Reference 13 included this radiation, or whether the ship's film badges had been given to TU 7 for processing before the ship departed Enewetak. 309