A doctor told me that powerful MRI can be dangerous. The power of the magnetic field can cause harm to a patient. I always thought magnets were harmless, but that is not the case. HDR or high dose radiation is a danger. OK one of the dangers of HDR is that it can erase your credit card. There are many more. In fact, you should keep all magnetic media such as video tapes, floppy disk, etc. away from a powerful electromagnet.
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