Two pulses of thermal radiation emerge from the fireball. The first pulse, which lasts about a tenth of a second, consists of radiation in the ultraviolet region. The second pulse which may last for several seconds, carries about 99 percent of the total thermal radiation energy. It is this radiation that is the main cause of skin burns and eye injuries suffered by exposed individuals and causes combustible materials to break into flames.

看明白沒有？那35%的thermal energy是指的核爆炸後1/10秒產生的紫外線和此後幾秒比紫外更長波的可見光線輻射出的熱量。核爆炸發生在0.8微秒之內，等那35%的thermal energy出來時，爆炸早完成了，還反射個屁的X-射線。