After IOS 15.5 update my iPhone is now emitting radio frequencies on airplane mode. Anyone know how to stop it?

I have been trying to reduce my exposure to RF's so mostly using iPhone on airplane mode and hard wired on my desk. I have a Cornet electrosmog meter which showed no RF's on airplane mode. After updating to IOS 15.5 this morning I now find that my phone is emitting RF's when in airplane mode and it was also emitting them when the phone was turned off. I figured it might be the new "Find my iPhone" setting to allow the phone to be found when powered off so I have disabled that and it worked for when the phone is powered off, but it is still emitting RF's, right up into the red zone in airplane mode. Anyone got any ideas?