What is especial with gallium-nitride ICs

GaN ICs sound interesting. I read the article you linked, and it seems like it will be more reliable. But just because its structural and material properties are more resilient than normal silicon ICs, I don't think this would mean they would work better in radiation environment.
When we create ICs for radiaition environments, we instead use redundancy techniques and use larger ICs.
 

You can generally expect better radiation tolerance of wide bandgap semiconductors. GaN is specifically described to have it.
 

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