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ships recards confirm that Takuwyo Maru wns at position quoted in
Japanose advisories (July Uh, 2000 Tokyo Standard Tim--153 degeces hS
mimutes East, 12 degrecs 23 mimites North proceeding on course West of
South) when they expericoced a rain squall beginning at 2000 and lasting
30 minutes. During this time their radiation levels increasod to nbout 15
tines background readings. Satuma Maru was at this time at 151 deprees
East, approxinately Vest af the Takuyo.
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Rabaul using the Takuyo's instruments,
was not concerned over any readings.
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Monitoring oftho Satuma was first dona at
The Satuma had a geiger counter but
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2. Gonplete examination of both vessels {including ropes and canvas)
revealed essentially only background radiation dose rate level on exposed
Readings in all enclosed spaces above ami below docks
were lower than background.
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Satuma did not pass thrinyh any
squall, According to the acacunt of the Takuyo Captain, he, acting upon
advice fran Tokyo, initiated decontamination proceduros on his personnel
decks and equipment.
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Rabaul backgronml readings taken ashore were
0,05-0, 07 millirsentgcns per hour, beta and gamma.
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In view of the above findings, no further decontaminstion procedures
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were considered necessary or advised.
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10 millircentgen per hour, beta and gamma, and a 1.2 gama only mllie
roentgen per hour reading. Both of these were covered by canvas during the
entire vq,age. Thea Satuma Cartein humorously offered the information that
this metal was of United States apa
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colored fuse setting ring and gunsight on the same gun the Satuna showed
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