title: Forces and torques produced by a 640-gauss permanent magnet of ferromagnetic objects.
abstract: Magnetic forces and torques were measured in a 640-G permanent magnet.  The forces on external objects were directed in such a way and of such a strength that the likelihood of injury from unsupported ferromagnetic objects was very small.  The forces and torques on ferromagnetic objects within the subject were comparable to those produced by gravitational and inertial efforts in daily living.
authors.affiliation: University of California, San Francisco, Radiologic Imaging Laboratory.
authors.forename: P
authors.initials: P
authors.lastname: Sheldon
authors.forename: L
authors.initials: L
authors.lastname: Kaufman
authors.forename: J
authors.initials: J
authors.lastname: Carlson
mesh_terms: D004869:Equipment Safety; D006801:Humans; D007501:Iron; D008279:Magnetic Resonance Imaging / Q000009:adverse effects; D008280:Magnetics; D019736:Prostheses and Implants