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Workers in a production line for synchronous motors occasionally reported tingling sensations or feeling of numbness in their hands when handling strong permanent magnets. As the magnetic flux density (B) and its gradients along and close to the surface of the permanent magnets were expected comparably high, and the movements of the workers hands may therefore cause relevant induction inside the tissue, a detailed dosimetric analysis of the in situ electric field inside the hands (Ei) of the workers was carried out. The time derivate of the magnetic flux density (dB/dt) occurring along the hands was determined based on time domain measurements using a specially developed "measurement glove" containing 12 Hall sensors. Based on these measurement results temporal peak electric field strength (Ei) induced inside a newly developed high resolution anatomical hand model were numerically computed, using the scalar potential finite difference (SPFD) method. The highest measured dB/dt along the palmar side of the hand was 51.2 T/s. The corresponding worst case temporal peak value of the maximum of the Ei averaged over 2 x 2 x 2 mm3 in soft tissue was 2.0 V/m, which is a factor of 1.8 higher than the applicable exposure limit value, but still below the range of 3.8 - 6.2 V/m which is presently assumed the range of lowest stimulation threshold for peripheral nerves. Our analysis did therefore not provide an indication that the perception reported by the workers are due to tissue stimulation in the sense of provoking action potentials.
This article was published in the following journal.
Name: Journal of radiological protection : official journal of the Society for Radiological Protection
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A system of safety management (abbreviated HACCP) applied mainly to the food industry. It involves the analysis and control of biological, chemical, and physical hazards, from raw material production, procurement and handling, to manufacturing, distribution and consumption of finished products.
The analysis of a chemical substance by inserting a sample into a carrier stream of reagent using a sample injection valve that propels the sample downstream where mixing occurs in a coiled tube, then passes into a flow-through detector and a recorder or other data handling device.
Any aspect of the operations in the preparation, transport, storage, packaging, wrapping, exposure for sale, service, or delivery of food.
Burns caused by contact with or exposure to CAUSTICS or strong ACIDS.
The prevention of infection or disease following exposure to a pathogen. This is most frequently addressed by administering a vaccine or anti-viral medication following exposure to a virus.
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