"Brad Guth" wrote in message
om...
| (Alan Anderson) wrote in message
...
|
| What does secondary radiation have to do with illumination, solar or
| otherwise? It's an issue when talking about shielding from cosmic rays,
| not walking on the lunar surface.

snip

| In other words, our sun is by far a seriously big cosmic source of
| rays.

No. High-energy cosmic rays do not come from the sun. They come from
outside the solar system, and our sun is the primary defense against them.
The particles released by the sun itself are of considerably lower energy
and thus their secondary effects in the ambient are minimal.

| On top of all that, lunar soil and rock is supposedly of mostly
| basalt, which is not only relatively dark in color (near black) but
| far denser than aluminum and, thereby creating greater amounts of
| secondary radiation in the form of hard X-Rays.

Molecular weight, not bulk density, better determines a substance's ability
to generate secondary radiation.

--
|
The universe is not required to conform | Jay Windley
to the expectations of the ignorant. | webmaster @ clavius.org