Purpose

Over the past decades, mobile phone usage have increased dramatically. Extensive development and use of mobile telecommunication services has increased exposure to radio frequency electromagnetic waves (RF-EMW) in the daily lives of humans, and concerns about the harmful effects of mobile phones have also increased on human health. Therefore, this study aimed to investigate the effect of battery charge levels of the mobile phone on electromagnetic waves emission.

Methods

The mobile phone used in the current study was HTC One E9+ (0.181 W/kg SAR) with a non-removable battery model Li-Po 2800 mAh. The power density was measured with the mobile phone set to operate at the 2G mode by a SMP2 Portable Electromagnetic Field Monitoring System. Power density was measured in Calling mode (50 sec), Called mode (40 sec) and Talking mode (360 sec) at the battery charge levels of 1, 5, 10, 15, 20, 30, 50, 60, 70, 80 and 100%.

Results

In Calling mode, the maximum electromagnetic waves were determined when the mobile phone had 1% battery charge and also while it was being charged. Contrary to Calling mode, there is no statistically significant difference between the power density emitted in Called mode and Talking mode at the various battery charge levels. Power density was found to be highest in the Called mode (29.11 μw/cm²), and to be higher in the Talking mode (23.005 μw/cm²) than in the Calling mode (10.27 μw/cm²).

Conclusions

The data of the present study can be used to monitor the daily exposure of mobile phone users as well as to estimate exposure levels in the laboratory and non-laboratory studies. As long as a mobile phone that is in the standby mode remains within the geographic domain of the operator’s service zone, the power density emitted from that phone will be virtually zero, and any background wave can be attributed to other sources.

中文翻译：

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手机电池电量水平对电磁波发射量的影响。

目的

在过去的几十年中，手机的使用量急剧增加。移动电信服务的广泛开发和使用增加了人类日常生活中射频电磁波（RF-EMW）的暴露，对手机有害影响的担忧也增加了对人类健康的担忧。因此，本研究旨在调查手机电池电量水平对电磁波发射的影响。

方法

当前研究中使用的手机是 HTC One E9+ (0.181 W/kg SAR)，配备不可拆卸电池型号 Li-Po 2800 mAh。功率密度是通过 SMP2 便携式电磁场监测系统将手机设置为 2G 模式进行测量的。功率密度在通话模式（50 秒）、被叫模式（40 秒）和通话模式（360 秒）下测量，电池电量为 1、5、10、15、20、30、50、60、70、80和 100%。

结果

在通话模式下，最大电磁波是在手机电量为 1% 时以及正在充电时确定的。与通话模式相反，在不同电池电量水平下，通话模式和通话模式下发射的功率密度在统计上没有显着差异。发现功率密度在 Called 模式下最高 (29.11 μw/cm ² )，在 Talking 模式下 (23.005 μw/cm ² ) 比在 Calling 模式下 (10.27 μw/cm ² ) 更高。

结论

本研究的数据可用于监测手机用户的日常暴露，以及估计实验室和非实验室研究中的暴露水平。只要处于待机模式的手机保持在运营商服务区域的地理范围内，该手机发出的功率密度几乎为零，并且任何背景波都可以归因于其他来源。