XPost: sci.physics.relativity   
   From: jeroen@nospam.please   
      
   On 2/19/26 13:39, Bill Sloman wrote:   
   > On 19/02/2026 9:56 pm, J. J. Lodder wrote:   
   >> Bill Sloman  wrote:   
   >>   
   >>> On 19/02/2026 7:49 am, Ross Finlayson wrote:   
   >>>> On 02/18/2026 12:43 PM, Python wrote:   
   >>>>> Le 18/02/2026 à 20:13, Ross Finlayson a écrit :   
   >>>>> ..   
   >>>>>> and, you know, magnetic monopoles, is widely employed   
   >>>>>> in medical imaging and the like.   
   >>>>>   
   >>>>> No.   
   >>>>   
   >>>> Resonance imaging (NMR) is a thoroughly different mechanism   
   >>>> than Roentgen rays.   
   >>>   
   >>> But as the name implies, it's nuclei of the atoms involved that exhibit   
   >>> the resonance. It's a remarkably low energy effect, and you need   
   >>> remarkably high magnetic fields to get it to give you a detectable   
   >>> signal.   
   >>   
   >> Nevertheless, it is easily demonstrated in the kitchen   
   >> with some simple electronics.   
   >   
   > Sort of.   
   >   
   > https://en.wikipedia.org/wiki/Nuclear_magnetic_resonance   
   >   
   > There are lots of different ways to exploit nuclear magnetic resonance.   
   > The earth's magnetic field is high enough to let you devise experiments   
   > that can demonstrate the effect on a kitchen table. Medical imaging   
   > works a lot better with high fields. In 1979 I got to ask the EMI   
   > Central Research NMR imaging development team why they weren't using   
   > super-conducting magnets, and got told that you couldn't modulate the   
   > field.   
   >   
   > The fact that you couldn't modulate the total number of flux lines   
   > threading a super-conducting coil didn't mean what they thought it did   
   > at that time.   
   >   
      
   "Number of flux lines"?   
      
   Jeroen Belleman   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)