Removal with Chemical-Dissolution of Surface Silver Grains Generated on the Development of Nuclear Emulsion Films

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  • 原子核乳剤フィルムの現像時に生じる表面銀粒子の化学的溶解除去
  • ゲンシカク ニュウザイ フィルム ノ ゲンゾウジ ニ ショウジル ヒョウメンギン リュウシ ノ カガクテキ ヨウカイ ジョキョ

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Abstract

In the developing process of nuclear emulsion films, silver atoms are often generated on the film surface and silver grains irrelevant to the tracks are adhered on there. They obscure the tracks composed of silver grains. We have de- veloped a method for removing these surface silver grains by exposing them with hydrophobic iodine vapor to make to silver iodide and fixing them. The silver grains on the surface were altered to silver iodide by this treatment, but the iodine vapor could not penetrate into the hydrophilic emulsion layer and the developed silver grains on the track were left as they were. Only the grains at the terminal of the track that appeared on the surface were altered to sil- ver iodide. These silver iodide grains were removed by fixing treatment. Chemical removal of the surface silver grains on nuclear emulsion films was demonstrated to improve the efficiency of track detection.

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