-~ 45 Japanese scientists.
The Russian ship "Vityaz" entered
the area in 1958 during its 27th voyage (Kreps 1959) but
radiological information ahout the voyage is not known at
this time.
Following the Castle test series of March 1 ta
May 14,
1954 at Bikini-Eniwetok and during which time the
Japanese fishing vessel,
"Lucky Dragon," was caught in
fallout of March 1, a survey was made in the Bikini area
during the month of June by the Japanese vessel, "Shunkotsu
Maru."
Miyake et al (1956) reported that fallout was
present in samples collected about 1,200 miles west of
Bikini nearly four months after March 1,
of about 10 miles per day.
a rate of advance
A second measurement of radio-
activity in the ocean from the same test series was made
by United States'
(Harley 1956).
scientists in March and April,
About 400 days after March 1,
1955
1955, fall-
out was detected in water samples from off the south coast
of Japan,
a distance estimated to be 3,300 miles from
Bikini, a rate of advance of about 8 miles per day.
Estimates made of the westward movement of radioactive
waters from the area of Bikini-Eniwetok after the 1956 and
1958 test series, for periods of 43 days and 21 days res-