2011年5月
Measuring Exposed Magnetic Fields of Welders in Working Time
INDUSTRIAL HEALTH
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- 巻
- 49
- 号
- 3
- 開始ページ
- 274
- 終了ページ
- 279
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.2486/indhealth.MS1269
- 出版者・発行元
- NATL INST OCCUPATIONAL SAFETY & HEALTH, JAPAN
The assessment of the occupational electromagnetic field exposure of welders is of great importance, especially in shielded-arc welding, which uses relatively high electric currents of up to several hundred amperes. In the present study, we measured the magnetic field exposure level of welders in the course of working. A 3-axis Hall magnetometer was attached to a subject's wrist in order to place the sensor probe at the closest position to the magnetic source (a cable from the current source). Data was acquired every 5 s from the beginning of' the work time. The maximum exposed field was 0.35-3.35 mT (Mean +/- SD: 1.55 +/- 0.93 mT, N=17) and the average value per day was 0.04-0.12 mT (Mean +/- SD: 0.07 +/- 0.02 mT, N=17). We also conducted a finite element method-based analysis of human hand tissue for the electromagnetic field dosimetry. In addition, the magnetic field associated with grinders, an air hammer, and a drill using electromagnetic anchorage were measured; however, the magnetic fields were much lower than those generated in the welding process. These results agreed well with the results of the electromagnetic field dosimetry (1.49 mT at the wrist position), and the calculated eddy current (4.28 mA/m(2)) was much lower than the well-known guideline thresholds for electrical nerve or muscular stimulation.
- リンク情報
- ID情報
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- DOI : 10.2486/indhealth.MS1269
- ISSN : 0019-8366
- eISSN : 1880-8026
- PubMed ID : 21670555
- Web of Science ID : WOS:000291189600003