The Digital Shutterbug (aryx) wrote,
The Digital Shutterbug
aryx

This journal has been placed in memorial status. New entries cannot be posted to it.

Lately, I have been getting into one TV show, Smallville, on the WB. (Typically, I don't watch much TV.)
On the last episode, this kid got exposed to meteor rock (kryptonite, I assume) when a thug broke a glass and slashed open the kid's forehead. The meteor rock got into his bloodstream.
At the hospital, the doctors attempted to perform an MRI (Magnetic Resonance Imaging) scan on him.
Because of the meteor, something had happened to the kid, and the MRI scanner started going blitzo.
Now here comes the funny part (at least to me):
In an attempt to shut down the scanner, a guy runs to the wall, and unplugs the machine!
Why is this funny?
1) MRIs aren't plugged into wall outlets, a regular 110V power supply is no where near enough. They are hardwired. To plug them into a wall outlet, you'd have to have the whole room filled with outlets, lots and lots of them on each wall, and all on different circuits.
If you know anything about EM (electromagnatism), you'd also know that when electricity is dynamic ("on the move", travelling through power lines, etc.), they also have a magnetic field. You start putting power through a cable or wire, the strength of the MRI's magnetic field would pull the cable right out of the socket... if not the socket itself, and the cables in the walls.
2) MRIs cannot be turned off. They need to use superconducting electricity cables. In order to get this, they are at approximately -200 degrees. If you shut an MRI off, turning it back on is a major feat, taking almost a week to cool down the coolant system, and perform system checks, and all sorts of other things.
3) The kid was still wearing his street clothes. If you've ever had an MRI, you were asked to remove all metal from your body, and changed into a gown. The magnetic force is so strong in an MRI, that it would pull buttons of your jeans, and metal zippers off your coat. If this were to happen, that stuff would fly to the center of the MRI scanner, and the system would have to be shut down to remove it. An MRI scanner is typically 1.5 Tesla, far greater than the Earth's magnetic field, and so strong, that you couldn't "muscle" the object out by grabbing it and pulling it. It's that strong!

Physics side note:
Most forces, like gravity and radiation (light, x-ray, micro-wave, and radio-waves) follow the inverse square law. If you double your distance from the source, the intensity is 1/4th that than your original distance. And inversely, if your halve your distance, the intensity is four times greater. The formula is simple: I=1/d2. If I remember my physics corectly (and I might not), the Strong and Weak forces of the atom, and magnatism from the EM (electromagnatism) follow the inverse cubed law. If you double your distance, the intensity is 1/9th the strength. And, if you halve your distance, it's nine times greater. Don't quote me on this, because it might not include magnatism, but I have it stuck in my head that it does. I'm sure landocalrissian would know, or several others of you out there, who would be glad to correct me if I'm wrong. I don't have time to look it up right now, because I'm already running late getting to work.
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