JF Ptak Science Books Quick Post
This is a good, typical portrait of Enrico Fermi--the thing that makes it "unusual" I think is that it comes with the official caption and also is dated just a few days after the bombing of Hiroshima and Nagasaki.
The photograph is definitely original and at the very least an issue of either a news photo service agency or the U.S. Government. Given how quickly the image was released with its association to the atomic bomb (just four days after Hiroshima) I'm guessing that this is a federal source. My limited experience with governmental press releases concerning the atomic bomb leads me to believe that this was issued on 10 August--the government no doubt had prepared documents like this for pre-release (as we have seen with the initial Trinity tests and documents associated with that), but I feel confident that this photo and description are in fact in the first wave of "publicity" following the use of the bombs at Hiroshima and Nagasaki.