If you type Pripyat, you will be suggested about the hotspot there. Pripyat is in Chernobyl Exclusion Zone. The highest measurement in the map is 12.60 μSv/h. According to https://www.chernobylgallery.com/chernobyl-disaster/radiatio..., there are some open places that reach this high, like a cemetery where measurement that can reach 22 μSv/h, but in a few closed places, like Hospital 126 basement, it can be way higher, higher than 380 μSv/h.

Also, if you type Fukushima, and it will be suggested a spot with measurements of 61.63 μSv/h.