“Are there any health risks with exposure to UHF radio frequency?” experts advises in response ““people should remain at least 1 meter (3.3 feet) from a uhf reader”.
WHO considers active RFID / Ultra High Frequency (UHF) electromagnetic radiation carcinogenic in nature that can cause cancer and tumors.
Accuracy Limitation of UHF for School Attendance?
A passive ultra-high frequency (UHF) system offers a longer read range, so if students were to wear RFID tags, it could pick them up automatically. However, water absorbs RF energy at the UHF frequencies and the human body is mostly composed of water, so it can be a challenge to read tags consistently and reading accuracy is not satisfactory.
