qu
Meg.
No crifical recoveries were delayed more than 24 hours, Roll-up operations
in the Yuroch{-Aomoen chain were curtailed by the contamination resulting
from SEshot.
The only significant fallout observed at Eniwetok Atoll (on Parry and
Eniwetok) during the operation resulted from-MMW shot at Bikini.
Fallout started at approximately 1500, July 21, and ended approximately
0800, July 22. Peak intensity measured on Parry reached 100 to 120 mr/hr
depending upon the location. Early decay was rapid, but after 48 hours the
decay of the active material followed the fission product decay curve. The
impact of this dose rate on the Eniwetok roll-up was such that a 7 r total
dose limit was established by CJTF 7 for 7.1 and 7.5 personnel.
Fallout was observed at Bikini (Enyu) oneday ‘after
Maximum level observed was 12 mr/hr.
The
vent also caused
minor fallout on Enyu; maximum level observed in this case was 10 mr/hr.
A total of approximately 500 water and soil samples were handled at
both atolls by laboratory personnel. Swimming areas at both atolls were
declared off limits for several days following certcin of the shots that sig- ~
nificantly increased the lagoon contamination levels. An arbitrary limit of |
50,000 disintegrations per minute per liter of water was established as the —
tolerance level for swimming,
4.7.4
;
Official Dosimetry
The permanent badge program was designed to provide a dosage-indicating device to all personnel in the Task Force. Issue of the first permanent badges was made on April 15, 1956, with exchange scheduled approxi-
mately each six weeks. As the operational phase progressed, it was found
that permanent badges in use in excess of four weeks were badly water~-.
marked and difficult to read. As a result, the exchange period for TG 7.1
and TG 7.5 was shortened to three weeks. During the operation approximately 40,000 permanent badges were issued, processed, and recorded.
The mission badge program was designed to provide a rapid determination of the dosage an individual had received while participating in recovery or construction missions in radexareas.
Only those personnel en-
tering a radex area were provided with mission badges. No deficiencies
were noted in these badges as the usual period of wear was approximately
12 hours. A total of 30,000 mission badges were processed at Eniwetok,
and approximately 20,000 at Bikint.
All film processing and record posting were done manually. As a result, approximately 40 individuals out of the entire Task Unit strength were
assigned to the dosimetry and records sections.
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