From: henry@spsystems.net   
      
   In article <1g44r6q.86im80w9c9acN%andekl_no@saaf_spam.se>,   
   =?ISO-8859-1?Q?Anders_Ekl=F6f?=  wrote:   
   >> To stop X-rays, you basically need mass.  Most any kind of mass is as good   
   >> as any other kind; essentially nothing is transparent to X-rays.  So that   
   >> extra 1m of water does not add very much more shielding against X-rays.   
   >   
   >Actually - 1 meter of water roughly reduces hard x-rays by a factor of 5   
   >to 10 depending on energy.   
      
   Notice the word "more" in my statement. :-)  Yes, 1m of water will cut   
   X-rays down a lot... but compared to an atmosphere equivalent to 10m of   
   water, the improvement from an extra 1m of water is slight.   
   --   
   MOST launched 30 June; first light, 29 July; 5arcsec    | Henry Spencer   
   pointing, 10 Sept; first science, early Oct; all well.  | henry@spsystems.net   
      
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