Speaker
Description
Cosmic-ray muon imaging with nuclear emulsions is an effective method for investigating the interior of large-scale structures, with expected applications for various targets such as volcanoes and industrial plants.
However, in high-temperature environments—such as during summer—the recorded particle tracks significantly disappear due to latent image fading, which restricts long-term observations. Therefore, it is necessary to suppress this fading for the practical use of nuclear emulsions under high-temperature conditions.
One of the primary causes of latent image fading is the oxidation and decomposition of the latent image (silver clusters) by hole-derived Br2 generated during its formation. In this study, focusing on the halogen bonding between Br2 and methionine, we devised a method to trap and deactivate Br2 using methionine within the gelatin. We applied fish gelatin , which contains 2.5 times more methionine than bovine bone gelatin , to nuclear emulsions and evaluated its effectiveness.
In this talk, we will present the experimental results and discuss the feasibility of cosmic-ray imaging with Nuclear Emulsions under high temperatures.