spectroscopy - What is the spectrum of a nuclear bomb in a vacuum?

This question about 'nukes in space' mentions that the two forms of energy released from a nuclear bomb come from neutrons and photons (the latter about 10⁴ times the former).

It's mentioned that the photons are in the form of X-rays, but what is the actual spectrum of the light emitted? How much of the light comes from

• the fission (assume pure-fission bomb for simplicity) where ²³⁹Pu is split into a mish-mash of lighter elements (is this energy quantized, i.e. has "peaks"?)


• black-body emission (the results being heated to 10^x K; is this continuous or does strange stuff happen at very high temperatures?)


• extremely short-lived fission products