#91316
01/08/2003 9:49 PM
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Joined: Dec 2002
Posts: 122
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member
Joined: Dec 2002
Posts: 122 |
what does sielding mean??
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#91317
01/08/2003 9:59 PM
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Joined: Sep 2001
Posts: 6,296
Carpal Tunnel
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Carpal Tunnel
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#91318
01/08/2003 10:01 PM
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Joined: Apr 2000
Posts: 10,542
Carpal Tunnel
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Carpal Tunnel
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>sielding = shielding
just a typo, then.
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#91319
01/08/2003 10:04 PM
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Joined: Sep 2001
Posts: 6,296
Carpal Tunnel
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#91320
01/09/2003 2:23 PM
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Joined: Jan 2001
Posts: 1,156
old hand
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old hand
Joined: Jan 2001
Posts: 1,156 |
WW,
Fe = iron, probably*, and
PMT = photomultiplier tube
* When I worked in an atomic physics lab they used a special type of metal to keep magnetic fields out of the experimental area. Very expensive. It was called mu-metal (as in the Greek letter mu which is used to represent the magnetic permeability). Maybe the Fe-shielding is similar.
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#91321
01/09/2003 2:26 PM
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Joined: Sep 2001
Posts: 6,296
Carpal Tunnel
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#91322
01/09/2003 2:28 PM
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Joined: Dec 2000
Posts: 13,803
Carpal Tunnel
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Maybe the Fe-shielding is similar
Soft iron will shield, to some extent, against magnetic fields. Probably not as welly as mu-metal, but if the application isn't as senstive, probably well enough.
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#91323
01/09/2003 2:45 PM
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Joined: Jan 2001
Posts: 1,156
old hand
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old hand
Joined: Jan 2001
Posts: 1,156 |
It has to do with the magnetic properties of the metal. Lead isn't magnetic. So it can't be used to shield from magnetic fields. Iron is magnetic. Mu-metal is probably some fancy alloy. Super-duper expensive.
You're probably thinking of radiation shilding. A whole different ballgame. In that case they do use lead. And depleted uranium. Edit: and concrete, and heavy concrete. And other stuff.
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#91324
01/09/2003 2:52 PM
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Joined: Dec 2000
Posts: 13,803
Carpal Tunnel
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heavy concrete
Is that concrete they made using heavy water?
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#91325
01/09/2003 3:03 PM
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Joined: Jan 2001
Posts: 1,156
old hand
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old hand
Joined: Jan 2001
Posts: 1,156 |
I don't remember what's in it and since it was my last degree that was in medical physics, my radiation protection course notes are at home. I don't know what makes it heavy. For that matter, it might be called dense concrete. Anyway, it's expensive but you need less of it for a given amount of shielding.
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#91327
01/10/2003 1:41 PM
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Joined: Jun 2002
Posts: 161
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#91328
01/10/2003 1:55 PM
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Joined: Dec 2000
Posts: 13,803
Carpal Tunnel
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