1 oe yes yt Dbats, © dae af OE A fallout-recording device had been left by a representative of the Nealth and Safety Laboratory (HASL) of the AEC, New York Operations Office, “nO was concerned with recording offsite fallout. The device was cali- Srated to record the low levels of radiation expected at offsite locations. its maximum reading was 0.100 R/hr and the HASL representative had warned the Rongerik personnel to contact him if the meter reading went "off-scale" (i.e., if the radiation exceeded the measuring capacity of the device). Such a message was sent at 1515, was received at the Airways and Air Communications Service (AACS) Center at Enewetak at 1543, and delivered to the Army Communications Center at Enewetak at 1547 for retransmittal to Hq JTF 7. Records do not show if this message was retransmitted or not but, at any rate, 7 am Ae eines. at Rongerik the command levels were unaware of the extent of the fallout (Reference 83). The personnel at Rongerik continued normal activities during the remainder of the day. Most changed from the usual tropical short sleeves and shorts to long sleeves and long pants. to a depth of 1/4 to 1/2 inch The fallout material gathered (0.6 to 1.2 cm) deep in places and left a visible layer on tables in the mess hall and barracks (Reference 68}. Ss ae tae eRe id an: Those at Rongerik made some simple scientific observations of this fallout. They observed it under a microscope, and they also noted that it made a cathode ray tube glow (Reference 68). Meanwhile, at those fleet units arrayed in a sector bounded by 110° and 155° bearings from ground zero at ranges from 20 to 70 nmi (37 to 130 km), a second fallout began about 1300 and continued into the evening. reached maximum at 1800 and had ceased by 2400. It This fallout appeared to be composed of much smaller particles that had taken considerably longer to fall from the great heights to which they had been carried than the large particles from the morning fallout. turned on. Again washdown systems were A TG 7.1 radsafe representative on the Bairoko advised that all nonessential personnel remain below decks to minimize the possibility of inhaling the small particles (Reference 79). 217