The GRAINE experiment observes cosmic gamma rays emitted from galactic central regions and pulsars.
This is an experimental plan for the purpose of performing precise observations.
So far, production experiments have been conducted in 2011, 2015, 2018, and 2023.
In the 2023 experiment, a scaled-up balloon experiment compared to the 2018 experiment will be conducted.
Along with that, there are changes such as transportation methods compared to past experiments,
A transport film test was performed.
A large number of nuclear emulsion plates were also developed.
In this paper, I will explain the results of the transport film test
and the details of the development work to efficiently develop a large number of nuclear emulsion plates.