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Abstract
The electrical properties of unexposed silver halide emulsion were studied by applying Wagner polarization. The experiments proved that a few free electrons and holes existed in the unexposed silver halide emulsion microcrystals. These factors are essential for the formation of fog centres, and there were some relationships between the fog centre formation and the electrical properties. The changes in electron conductivity indicated the intrinsic factors of fog formation in AgBr emulsions. The changes in hole conductivity revealed the capability of iodide ion, used as a crystal conditional agent, to trap holes. When shallow electron-trap dopant was added to the silver halide crystals, the electron conductivity of the emulsion increased, while the hole conductivity decreased.