Reduce/increase radiation according to use

I was wondering if it's possible to reduce the radiation of the router, I was thinking something like this:
- No devices connected to wifi: Lowest possible radiation, just enough to pick up the signal on a ipad/laptop/smartphone
- When device is connected: Emit/power radiation according to what is needed. For whatsapp message that comes in: low. Downloading a big file: high radiation, as soon as file has stopped lower it again.
Surfing the net: high radiation

So instead of having a constant...

Reduce/increase radiation according to use