I found this map. Can't vouch for veracity but it shows 65,500mSvh at Chernobyl. Look at the northern end of the lake to find it. Somebody be lyin'.
https://www.saveecobot.com/en/radiation-maps#10/51.3829/30.5516/gamma/comp+cams+fire
I don’t know about the readings, but I have read that the lake is a hot spot.
CC