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Electromagnetic Field Radiation Exposure Assessment from Mobile Phones Based on Call-Related Factors

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For many years, there have been concerns about possible human health risks connected to the usage of mobile phones especially at close proximity. This is primarily due to the exposure to electromagnetic field (EMF) radiations that emanate from them. These concerns have in turn provoked a large bulk of research studies. However, the conflicting reports of previous research works on the effect of the exposure to EMF sources lead researchers to continue studying the issue. In this work, by means of the exposure evaluation technique, measurements of EMF radiations, in terms of power density, are conducted on different models of mobile phones in an indoor environment via the call-related factors: between the dial and reception of a call from different models of mobile phones, for a period of six months. The investigated brands of mobile phones were all placed to face the field strength meter sensor in active call modes at 0.05m measurement interval when taking reading on the tri-axis planes. The results obtained revealed that the EMF radiation intensity, in terms of measured power density from the mobile phone, varies and depends on the mobile phone model brand. It ranges from 1.25 to 800.5 mW/m2 with the highest from ITEL phone (Model-TI65800) with MTN Network along the Z-plane and the lowest from NOKIA phone (Model-105) with MTN Network along the Y-plane. The highest radiation intensity was recorded for calls made during the dial (before picking) from all the selected mobile phone models. In particular, from the results, it was observed that the amount of EMF radiations decreased about 20 to 30 % if the mobile phone handset is moved away from the EMF meter from 1cm to 5cm. Accordingly, for EMF exposure safety, it is recommended that the mobile phone is placed 5–10 cm away from the body during conversation.
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Mobile Phones; Electromagnetic Field; Radiation Exposure Level; Radiation Intensity; Human Health; Power Density

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