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the diving suit on each dive; one in the shoe top, one at hip level, and one at
shoulder or chest level. These badges were developed daily for the first two weeks,
and then after every three dives for the remainder of all diving operations. In
addition, each diver carried a pencil-type pocket dosimeter within his suit.
Q
Gear employed 1n the photographic dosimetry work was as follows:
A. An Ansco-Sweet densitometer for reading the densities of films exposed in
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the film badges
B.
Type K film badges obtained from Radiation Laboratory, San Francisco Naval
C,
Holders and DuPont film packets obtained from Atomic Energy Commission at
Shipyard (500 badges)
Oak Ridge, Tennessee (300 holders and 5,000 packets) ©
The Type K film, as supplied by Naval Radiation Laboratory, has a thin lead
cross upon it, which etops the beta radiation but 1s penetrated by the gamma radiation; the area not covered by the cross is exposed to both beta and gamma radiation.
CO
PARTIAL DOCUMENT
The type of badge supplied by the Atomic Energy Commission also is designed for
beta and gamma radiation. It consists of a film packet in a stainless steel holder,
the upper half of the packet being shielded on both sides with cadmium. This upper
section is used for gamma-ray dosimetry. A window in the lower half of the steel
holder permits exposure of the packet to both beta and gamma radiation. During the
latter part of the resurvey operation the steel holder was not used. Film packets
with cadmium shields were inserted into rubber aheaths for protection against water.
tion.
Film badges of each type were exposed to a standard radium source for calibraEach type of film badge had an approximate sensitivity range of from 0.02 r
to 2.0 r.
During the period from 15 July to 29 August 1947, a total of 572 film badges
were developed, and the exposures interpreted. None of these badges was found to
have been exposed to sufficient radiation to acquire computable density. From
film-badge data it was determined that there were no personnel exposures in excess
of the daily tolerance limit of 0.1 r, beta plus gamma. All developed badges were
alphabetically filed, and will be permanently stored at the Radiation Laboratory,
San Francisco Navel Shipyard, as a permanent exposure record for personnel connected with this resurvey operation.
It should be emphasized that in operations such as the Bikini Scientific Resurvey it often is necessary to protect film badges with rubber sheaths because
otherwise they become water-soaked, In the initial stages of the operation many
badges were completely ruined by failure to observe this precaution, even when the
majority of the work was done on dry land. Frequently the badges became soaked
while wearers were returning to the ships in amall boats,
Generalprecautions, Until radiological clearance was given any particular
area or island, personnel entering such an area wore full suits of protective
clothing.
f
é
Before the start of operations in Bikini Lagoon, a decontamination station was
Bet up in a forward troop head. This station was secured from adjacent living
spaces, Contaminated personnel entered on the starboard side, removed clothing,
scrubbed and showered, were monitored, dressed in clean clothing, and left the
station on the port side. Scrub brushes, soap, towels, and a bin for contaminated
clothing were provided. The contaminated and clean sides of the station were
Declassified by DNA, Chief, ISTS
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