-=> Quoting Charles Angelich to Mike Ross <=-

 CA> AFAIK nothing stops Gamma radiation. 
 

 But anything/everything, in proper thickness, will
 reduce/lower its level by half.  Ever pay attention
 to x-ray technicians operating their equipment from
 a "block house" while you're being exposed?

 I don't have my notes from the 1958 ABC Warfare School
 (now NBC) I attended, but I do remember that the strength
 or level of radiation can be reduced/lowered.

 Concrete and iron/steel are the more popular materials.
 Enough thickness and you reduce it by 1/2, 1/4/ 1/8,
 1/16, etc etc etc.  Glass and plain ol' dirt work too.
 During JFK's fiasco with Cuba and the missle "crisis"
 everyone who could afford one had a bomb shelter built
 under their home, under their lawns, wherever there was
 space to put one.   Today most of those shelter have
 been converted to wine cellars.

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