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Old Apr 23, 2010 | 6:17 am
  #16  
AngryMiller
 
Join Date: Apr 2009
Location: FrostByte Falls, Mn
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Originally Posted by ricktoronto
When I had the same test the hospital gave me a letter with the name of the isotope, when it was administered, Beq and half life. I was down to 1/64th of the original level when I went through YYZ and stood farther away than normal to play it safe.

You emit gamma rays with that isotope. So does fissionable bomb material.
The radiation emited from different sources has a different energy signature and by using that signature you can determine what is being detected.

Scintillation counter.
Last edited by AngryMiller; Apr 23, 2010 at 7:51 am Reason: added link
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