Radiative energy transport in hot dense matter has been investigated in the sub-keV region. In a medium-Z element (aluminum), ionization burn-through has been observed. Burn-through speed is estimated to be 6×{}10⁵ g/cm² sec or more at an x-ray intensity of 7.4×{}10¹² W/cm². At a high Z (gold), the spectral structure of transmitted x rays indicates the formation of an x-ray heat conduction band via absorption resonance. Penetration depth ({ρ} {Δ}R) of radiative energy transport in Au is found to be 3--4 times larger than that in aluminum.
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Mochizuki et al. (1987) studied this question.
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