| 摘要 |
A portable electronic device includes a transmitting circuit, an X-ray detector, and a controller. The transmitting circuit includes a power amplifier for amplifying radio waves. The detector is arranged to detect X-rays radiated from an installation arranged on a passageway to an area where radiation of electromagnetic waves is restricted. When X-rays with a certain intensity or more are detected by the detector, a controller recognizes that the device is about to enter the area, and reduce the gain of the power amplifier, so that the transmitting circuit is set to be unable to radiate radio waves.
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