Abstract
1. The formation of marine pearls containing rich amounts of manganese, and relationship between the degrees of coloration of pearl layers irradiated with radioactive-rays and their manganese contents were investigated. 2. By the injection of manganous carbonate paste, at a ratio of about 50mg anhydrous matter per shellfish, the manganese contents in the pearl layers of pearl oysters rose to about 300γ per g (about 3γ manganese deposited per pearl of about 4.5 mm in diameter) during 13 days. When manganous carbonate-peanut oil paste was used, the manganese contents rose to about 40 to 67γ per g (1.76γ per pearl). 3. It was recognized that the degrees of coloration of the pearl layer caused by γ-ray irradiation at a dose of 2×107 r for the marine pearl layers containing various contents of manganese are proportional to their manganese contents.
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