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> The shutter speed was probably a little slower than for the other photos in order for him to get into position, which explains why he seems to be moving and why the glow from his flashlight looks like a lightning flash. The graininess of the photo, though, is likely due to the radiation.

Yeah, wouldn't that have been exotic. Having worked many years with high end scanning and digitizing photographs from the 1850 to today I can say that apparent grain in a photo from the 80s is not a strange thing, especially if it's a high ISO film. Correcting a bad exposure when post processing enhances that grain. The "graininess" here looks more like interpolation artifacts after upressing, possibly a highly compressed JPEG, though.

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