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Physics of mag tapes

  I have been taking cart tapes for SMBX in and out of airport
  security for years now, and sometimes with the same tape a dozen
  times. Coming back from Boston recently I was met with shock from
  the security-person that I was doing this, because "everybody
  else passes them through by hand" and not through the x-ray
  Anyone really know what those things do, and whether it can, over
  repeated exposures, affect the oxide/fields on the tape?  I
  realize "it is probably better to be safe than sorry" but I was
  curious about the known realities here.