1958ネン ケイテンマル コクサイ チキュウ カンソクネン コウカイ ホウコク

Keiten-maru left Kagoshima harbour on July 9th, 1958 to complete the multiple shipsurvey in the western Equatorial Pacific, which was one of the IGY program, in cooperationwith Takuyo and Satsuma. The radioactivity was determined on board Takuyo to be terriblyhigh value at the northern side of the expected observing area. All the expected observationswere given up with many regrets