放射線照射による黒真珠生産の研究-III : 数種貝殼におけるγ線照射による着色とマンガン含量との関係

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1. To confirm the universally of the assumption that the coloration of pearls by irradiation with radioactive-rays is due to the coloration of manganese contained in them, the shells of 9 species of fresh-water shellfishes with various contents of manganese were irradiated with γ-rays. The relationship among the manganese contents, amounts of released iodine, and coloration in their shells was discussed.2. Coloration of the shells of fresh-water and marine shellfishes by irradiation with γ-rays, as shown in Fig. 1 (A-I) and Table 1, is proportional to their manganese contents and to amounts of released iodine in a reasonable accuracy. A few shells give conflicting results.3. The shell of “ Setashijimi ”, Corbicula sandai REINHARDT, was the only one having a samll amount of manganese and hardly colored by the γ-ray irradiation among the shells of 9 species of fresh-water shellfishes.4. The colored material which was produced in the shell irradiated with γ-rays was stable for 16 months or more at room temperature, but it is comparatively unstable and discolorable in high temperature over 50°C.
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