GAMMA-EMITTING RADIONUCLIDES IN TUNA SAMPLES FROM
THE TOKYO CENTRAL FISH MARKET,
1962
INTRODUCTION
Samples of tuna were obtained from the Tokyo Central Fish
Market for radiological analyses during the period from May 2
to October 31,
1962.
The fish were caught in the Western
Pacific Ocean by Japanese commercial fishermen before, during
and after the United States program,
in 1962,
of testing nuclear
devices near Christmas Island in the Central Pacific.
The sam-
ples were obtained by inspectors from the Tokyo Metropolitan
Food Inspection Office of the Tokyo Central Wholesale Market as
the fish were unloaded from the fishing vessels.
was divided:
of Health,
Each sample
one half was retained by the National Institute
Tokyo,
and the other half,
after drying, was sent to
the Laboratory of Radiation Biology, University of Washington.
The arrangements for obtaining these samples,
as well as similar
samples in 1958, were made by L.R. Donaldson, Director of the
Laboratory of Radiation Biology,
and T. Kawabata of the Depart-
ment of Food Control, National Institute of Health,
The kinds
Tokyo.
and amounts of gamma-emitting nuclides in these
samples are reported here.
The gross-beta and the gross-gamma
radioactivity of the duplicate samples has been reported by
Kawabata, Muira and Shimanuki
(1963).
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