http://www.revisemri.com/blog/2006/mri-and-credit-cards/ For your short relaxation times. Mon, 16 Aug 2010 10:54:40 +0000 hourly 1 http://wordpress.org/?v=3.0.1 http://www.revisemri.com/blog/2006/mri-and-credit-cards/comment-page-1/#comment-17206 Dave Higgins Mon, 29 Oct 2007 08:45:49 +0000 http://www.revisemri.com/blog/2006/mri-and-credit-cards/#comment-17206 <p>I have come across a pre-installation manual from one manufacturer which advises a limit of 1mT (10G) for credit cards, floppy disks, watches, clocks, and a number of other interesting items such as telephone switching stations and water-cooling equipment. I expect this limit is conservative. A number of levels are advised for various equipment and devices. For example, large moving metallic objects (elevators, escalators, traffic etc) are limited to 0.3mT (3G).</p> I have come across a pre-installation manual from one manufacturer which advises a limit of 1mT (10G) for credit cards, floppy disks, watches, clocks, and a number of other interesting items such as telephone switching stations and water-cooling equipment. I expect this limit is conservative. A number of levels are advised for various equipment and devices. For example, large moving metallic objects (elevators, escalators, traffic etc) are limited to 0.3mT (3G).

]]> http://www.revisemri.com/blog/2006/mri-and-credit-cards/comment-page-1/#comment-31 Doug Morris Mon, 14 Aug 2006 19:23:26 +0000 http://www.revisemri.com/blog/2006/mri-and-credit-cards/#comment-31 Over a period of 15 years of repeated testing, I've found that magnetic strips on credit cards are in peril of being wiped in fields greater than 5 mT (50G). RFID chips appear to be immune to large magnetic fields. Over the past 3 years I've tested a number of RFID laden cards in fields up to 7T. The Chip and PIN cards (SmartCards), I've tested (by accident since it was my subway pass) in a 10 mT (100G) field with no ill effects. Over a period of 15 years of repeated testing, I’ve found that magnetic strips on credit cards are in peril of being wiped in fields greater than 5 mT (50G). RFID chips appear to be immune to large magnetic fields. Over the past 3 years I’ve tested a number of RFID laden cards in fields up to 7T. The Chip and PIN cards (SmartCards), I’ve tested (by accident since it was my subway pass) in a 10 mT (100G) field with no ill effects.

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