# Lead shielding very close to the Sun

I understand that eventually lead would melt when it nears the sun. In a liquid state how effective would lead be in blocking radiation? Would it still be as effective as solid state of lead? What about lead in a gas state?

• TThe liquid and solid states have about the same density, so for alpha, beta, gamma, and neutrons they would be similar. Gas would have less on a per -thickness basis, but about the same on a grams per square cm traversed. – Jon Custer Mar 16 '16 at 16:57

All that really matters is the column density of the lead - how much mass per unit area you have. What this means is that if you change the state or density of lead then so long as you arrange it so that $\rho x$ is the same, where $x$ is the path traversed by the radiation, then the absorption due to the lead will be the same.