153 / 1363
Proximity Limits
•
Each scanner has its
‘footprint’
•
‘5 Gauss line’ (0.5 mT)
should be confined to
scan room
•
Radial & axial components
Typically axial 1.6 times larger
•
May be measured with
handheld gaussmeter
> 30 G Stainless steel, non-
ferromagnetic objects
< 30 G ECG monitors,
unrestrained
ferromagnetic objects
< 10 G Credit cards, x-ray tubes
< 5 G Pacemakers, general
public
< 3 G Moving cars etc
< 1 G TVs, CT & PET scanners
< 0.5 G Railways, gamma
cameras