The Effect of Operator Hand Position and Workstation Furniture on Foot Current for Radio Frequency Heater Operators

Abstract

Abstract The dependence of foot current on operator hand position and workstation furniture was studied to better assess and reduce operator exposure where reactive field coupling predominates (i.e., 10 to 100 MHz and within 1 m of heaters). Reactive coupling contributions to foot current have not been studied in a systematic manner in the laboratory or the workplace. The measurement of current induced in a worker's extremities (i.e., foot, ankle, arm, and wrist) is the most feasible and accurate method to assess reactive field exposures. A total of 72 measurements was made with four workers who were operating two radio frequency (RF) heaters in a workplace. All measurements were made twice in randomized order. Operator posture/furniture and foot current readings were documented by simultaneous videotape recordings. Foot current was determined as a function of 1) the operator's hand position, and 2) the type of stool used. With one exception, foot current increased when the operator's hands were extended ...