I think it’s going to get worse after he passes, because right now he has an active presence with its own will that his henchmen sort of have to listen to. After he goes, everyone around him is going to start doing some heinous shit “in his memory” or “because he would have wanted it”.
https://openscience.isae-supaero.fr/digitalCollection/DigitalCollectionAttachmentDownloadHandler.ashx?parentDocumentId=6163&documentId=11848&skipWatermark=true&skipCopyright=true
Pretty much, but highly dependent on the energy of the ionizing radiation. Lower would come out as a dull grain, higher would show up as bright spots. Neither would look like this post though lol