XPost: sci.electronics.design   
   From: noreply@ademu.nl   
      
   On 2026-02-19 21:41, J. J. Lodder wrote:   
   > john larkin  wrote:   
   >   
   >> On Thu, 19 Feb 2026 20:52:48 +1100, 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.   
   >>   
   >> The earth's field is enough. The hydrogen resonance is about 4   
   >> KHz/gauss.   
   >   
   >    
   >   
   > (paywalled, unfortunately)   
   >   
   > Jan   
   >   
      
   It's also here in the book in the archive, use a free account to borrow:   
      
       https://archive.org/details/amateurscientist0000unse_c9s8/page/338/mode/2up   
       the amateur scientist : Free Download, Borrow, and Streaming : Internet   
   Archive   
      
     I prefer the experiment to measure the   
   earth's magnetic field using MRI.   
   It is so rewarding to hear that ping after all your trouble.   
      
   Arie   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)