PTET Ga,
Pere
Ne I ee
eee
—
.
siienhesaanssadhesatheeainaneSaitanteam:inahiieelindelihatenh diehten
.
No critical recoveries were delaye) mure than 24 hours. Roll-up operations
in the Yurochi-Aomoen chain were curtailed by the contamination resulting
from).
\ shot.
he only siefflicant fallout observed at Eniwetok Atoll (on Parry and
Eniwetok) during the operation resulted from|
“Fl shot at Bikini,
Fallout started at approximately 1590, July 21, and ended approximately
0800, July 22. Peak intensity measured on Parcy reached 100 to 120 mr/hr
depending upon the leeation, Early decay was rapid, but after 48 hours the
decay of the active material followed the fission product decay curve.
}
The
eh ie Re re hE i Ahr ag TRAe RY ~
{impact of this dose rate on the Eniwetok roll-up was such that a 7 r total
dose mit was established by CJTF 7 fc7.1 and 7.5 personnel. _
Fallout was observed at Bikinl (Enyu) one day after f
hot,
Maximumlevel observed was 12 mr/hr. The
event also causcd
minor fallout on Enyu; maximum level observed in thls case was 10 mr/hr.
A total of approximately 500 water and soil samples were handled at
both atolls by laboratory personnel. Swimming areag at
declared off limits for several days following certcin of
nificantly Increased the lagoon contamination levels. An
50,000 disintegrations per minute per Htcr of water was
tolerance level for swimming,
°
4.7.4 Official Dosimetry
a
both atolls were
tne shots that sigarbitrary limit of
established as the
é
.
f
2
The permanent bade program was designed to provide a dosage-indi-
cating device to all personel in the Task Force,
Issue of the first pecma-
‘aent badges was made on April 15, 1956, with exchange scheduled approxi»mately each six weeks. As the operutionsl phase progressed, It was found
that permanent badges in use in excess of four weeks were badly watermarked 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 {ssued, processed, and recorded.
The mission badge program was designed to provide a rapid determination of the dosage an individual hat received while participating in recovery or construction missions in radex areas, Only those personncl en-
tering a radex area were provided with mission badges.
No defictencies
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 En{wetok,
and approximately 20,000 at Bikini.
All film processing and record posting were done manually.
As a re-
sult, approximately 40 individuals out of the entire Task Unit strength were
assigned to the dosimetry and records sectiuns.
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