this simplicity of detection of larger amounts of ferromagnetic contamination suggests that this method may be used in two applications : in detecting the presence of large amounts of asbestos ( ferromagnetic and harmful ) in the lungs of asbestos workers , and in tests of the condition of the lung where fe ( 3 ) o ( 4 ) dust ( ferromagnetic and harmless ) would be used as an inhaled tracer material .
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lungs
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of