Radiation Protection Dosimetry Advance Access originally published online on October 29, 2007
Radiation Protection Dosimetry 2008 129(4):397-402; doi:10.1093/rpd/ncm457
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Evaluation of radiofrequency dielectric heaters workers exposure
1 Regional Environment Protection Agency of Friuli Venezia Giulia (ARPA FVG), Department of Trieste, Via La Marmora 13, 34139 Trieste, Italy
2 Regional Environment Protection Agency of Friuli Venezia Giulia (ARPA FVG), Piazza Collalto15, 33057 Palmanova, Italy
* Corresponding author: benes{at}arpa.fvg.it
Received July 13, 2007, amended July 13, 2007, accepted October 3, 2007
Radiofrequency dielectric heaters (RFDH) are widely used in the woodworking industry for glueing laminates by applying pressure and RF heating. The workers operating such equipment remain in the vicinity of the machinery all day and can therefore be exposed to considerable levels of electric and magnetic field at RFs. This work describes the method used to measure the strength of fields generated by this particular machinery. This procedure is based on current methods cited in the literature and introduces the necessary modifications to meet this specific case. In particular, as there is often a scarcity of technical data available relating to such heaters, it is suggested that a spectrum analyser be used for measurements in the frequencies domain. On the basis of the data obtained the norms of reference are established, the instrumentation to be used in successive stages determined as well as the identification of possible sources of interference from spurious signals. Furthermore, a mapping of the field strengths is presented and the means of determining the decay curve as a function of distance. This last type of measurement is done to estimate the effectiveness of grounding the machinery. The report ends with an estimate of the exposure of workers to electromagnetic fields and also some recommendations for reducing risk.