I am looking for data source (or chart) of spectral data that is being emitted on detonation of nuclear or thermonuclear explosion. Reason I am looking is to see if this data has specific signature that would allow to differ it from the 'normal' radiation that stars emit. I would assume during nuclear explosion there's a lot more gamma radiation percent-wise from total radiation compared to solar witch should have less of it.
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This is a hard question to answer, in the end. However, be assured that long, long, ago we started looking for nuclear expositions by looking for X and gamma radiation using the Vela satellites http://en.wikipedia.org/wiki/Vela_(satellite). These did not find much in the way of violations of the nuclear test ban treaties but did discover astronomical objects called Gamma-ray bursters. The reason the "spectrum" question is hard to answer, particularly in the context of detection of nuclear explosions is that much of the X-ray radiation comes from how hot the explosion gets. And, much of the X and gamma radiation is absorbed reasonably quickly in the surrounding fireball.