Images Show Apollo Moon Flags Still Standing

You are oversimplifying things. Yes, slow moving charged particles (such as electrons or Helium nuclei) can be easily shielded. However, fast moving particles are much harder to shield against as they create showers of new particles (of lower energy) upon collision.

The spectrum of these particles extends way up - scientists are busily observing particles with energies on EeV scale (roughly what a moving golfball has), though these are quite rare.

Neutral particles, like gamma rays, can only be shielded by

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/afpBBEK01_Q/images-show-apollo-moon-flags-still-standing

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