XIX Sympozjum Srodowiskowe PTZE - materialy.pdf

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XIX Sympozjum PTZE, Worliny 2009 Finally they do not give us information how important are all objects placed in the proximity of exposed person. Moreover standards and accepted procedures do not specify these conditions. IEEE recommends [2] to use a Human Equivalent Antenna what is the proper solution at the plane wave condition [3]. Person with manpack radio on his shoulders is always in the near field region of the antenna. Because of that the Human Equivalent Antenna is useless for measurements of induced currents caused by manpack radio. Solution The goal of this study was to set conditions for induced current measurements in the body of manpack radio operator. The measurements have been performed with clamp-on current probe. The clamp-on current probe has been chosen because it is less responsive for ground conductivity and ground surface texture than platform meter. The induced currents have been measured in both ankles of three volunteers operating a few FM manpack radios in the frequency range 1,5 – 100 MHz. Exposed persons differ in height from 1,60 to 1,85 m. The currents have been measured in three typical for radio operator body configurations: 1) radio on the shoulders, 2) radio on the ground, operator stands beside, 3) radio on the ground, operator squats or kneels beside. Additionally we have examined if the grounding of the radio matters and how the object placed in the proximity of the radio disturbs the measurements. These objects were a concrete wall, a tree and a car. Conclusion There is no need to look for a special or average person to measure induced currents in his ankles, we do not see meaningful differences between our radio operators. The position of operator during the transmission has a great impact on current induced in his body, the values of currents in standing positions were almost twice as big as in squatting position or kneeling. The grounding of the radio is the key factor, the values of currents induced in the ankles dropped three to four times after the radio had been grounded. The objects in the nearness are not important unless they are conductors, but the measurements in the proximity of the car showed that we should keep distance of 3 to 5 meters from such objects. References 1. Directive 2004/40/EC of The European Parliament and of The Council of 29 April 2004 on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields). 2. IEEE C95.3-2002 Recommended Practice for Measurements and Computations of Radio Frequency Electromagnetic Fields with Respect to Human Exposure, 100 kHz-300 GHz. 3. Poljak D., Choy Y. T., Gandhi O., Sarolic A., Human equivalent antenna model for transient electromagnetic radiation exposure, IEEE/EMC Transactions 2003, vol. 45, iss. 1, pp. 141 – 145 4. Rozporządzenie Ministra Pracy i Polityki Społecznej z dnia 29 listopada 2002 r. w sprawie najwyższych dopuszczalnych stężeń i natężeń czynników szkodliwych dla zdrowia w środowisku pracy. 5. Wilen J., Mild K.H., Paulsson L-E., Anger G., Induced current measurements in whole body exposure condition to radio frequency electric fields, Bioelectromagnetics, 2001, vol. 22 iss. 8, pp. 560 – 567. 150
XIX Sympozjum PTZE, Worliny 2009 IMMUNOCORRECTIVE EFFECTS OF MAGNETOTHERAPY ADMINISTERED IN PATIENTS WITH THERMAL INJURY Introduction Wanda Stankiewicz 1 , Paweł Szymański 2 , Marek P. Dąbrowski 1 , Wojciech Witkowski 2 1 Military Institute of Hygiene and Epidemiology, Warsaw 2 Military Medical Institute, Warsaw The severe thermal injuries comprising more than 20% of body surface lead to the generalized reaction of the organism described as a „systemic inflammatory reaction syndrome” (SIRS). This kind of injury represents a strong signal for the immune system. The way of immune response depends on the range and intensity of the injuring signal and on the potential reactive abilities of the system. If the both elements are reciprocally balanced and the intensity of signal does not exceed the potential defensive abilities of immune system, the healing of injury proceeds without severe complications and the health status of patient may gradually improve. The immunoregulatory activity of thymic-dependent Treg lymphocytes represents one of the most important mechanisms by which the immune system may supervise and control the intensity of posttraumatic inflammation. The recent observations [1] describing the immunocorrective influence of low-frequency magnetic field seem to indicate that the magnetotherapy can be considered as a potential valuable component in the treatment of severe burn injuries. Aim of investigations The study was aimed to determine the influence of magnetotherapy (Viofor JPS) on the immunoregulatory functions of immune system, including the activity of Treg lymphocytes, in patients suffering from burn injuries. Material and methods The group of 40 patients (25 men and 15 women, age from 20 to 55 years with burn skin injuries in range from 20 to 50% of body surface) was enrolled to the study. 20 of them were treated on the conventional way and the remaining 20 received in addition the magnetotherapy [2], (Viofor JPS magnetic field generator, 14 daily expositions, 15 min each, according to M1P2 programme, with the use of a large ring applicator. The induced homogenous magnetic field represented basic pulses frequency of 180 – 190 Hz and magnetic induction B = 3,2 µT, mean, and = 40 µT at the peak of pulse). The control group consisted of 20 healthy men. 151
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