Effect of EM Radiation from Substation

[border-rider]

Depends on the format and machine......

0.5 to 1. Tesla is about the range...... However there are newer units up to 3 Tesla

Or 7 T for research...we did a project for HSE a couple of years ago on computational modelling of exposure from MRI

Comparing this to the microTeslas (Millionth) that are deemed safe for public exposure however is not possible. This is due to different exposure times as well as the strength and field itself.

Gradient coils operating at audio frequencies are the real problem

 

[rogerzilla]

His knob appears to have been affected by the magnetism, and adopted an odd shape.

[border-rider]

Actually...that guy was a death row prisoner who volunteered to be frozen and sliced up and imaged after his death.

He's a very odd shape cos he spent his time weight-lifting when on death row

More pics

[TimO]

Comparing this to the microTeslas (Millionth) that are deemed safe for public exposure however is not possible.

I'd hope so, given that the Eaths field, at the surface, is of the order of 60µT.

[border-rider]

With RF the issue is burns.

I've seen quite nasty RF burns, in fat patients.  Also overheating

The electrostimulation risk is from the gradient field

It's an issue for medical staff too, though the RF isn't.

[border-rider]

Comparing this to the microTeslas (Millionth) that are deemed safe for public exposure however is not possible.

I'd hope so, given that the Earths field, at the surface, is of the order of 60µT.

The limit for 50 Hz is 100 µT for the public. For static fields it's 40 mT.

[TimO]

Ah, fair nuff, it hadn't occured to me that the limits would vary with frequency, but they obviously do for RF, so why wouldn't they for B-field.

[border-rider]

If you're really interested I wrote a javascript calculator that tells you all the different international limits at any frequency from 0 Hz - 300 GHz.

Oh, what's that you say ? Not that interested ?

 

[Cunobelin]

MRI as a whole host of issues with patients... Careful preparation removes a lot such as interaction wit pacemakers, aneurysm clips and foreign objects like metal in eyes which can become exited, heated ormove due to the fields.

[worrywort]

you'll wake up pointing north every morning. i read a book years ago called 'the lightning book' which described all sorts of problems.