If you are concerned, you should change things. First, move the router to another location. Many do not use the router 24/7, so turn it off when not in use. There are products that claim to block the radiation but I have not seen any studies or reviews I trust on those products. Use wired connections, for example a laptop or other device transmits a signal back to the router when using WIFI. One of the best sources on the subject that I have found and trust is https://www.consumerreports.org/radiation/do-i-need-to-worry-about-radiation-from-wifi-and-bluetooth-devices/