The reason I ask is because my friend told me he is going on a tour of Pripyat in Ukraine which is where the chernobyl nuclear plant exploded and I heard people have said that as it was only 1986 that it happened that would mean there is still high amounts of radiation there?
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There's no clear answer to that question. It depends on a lot of things. The half-lives of the isotopes in question, the environment they're released into and the form the fission products take.
For example all the iodine-131 released in the blast is effectively gone. It has a half-life of about 8 days and has all decayed away. Others like cesium-137 and strontium-90 stick around much longer. Much of it has been washed off the buildings and the streets and with the rainfall it sinks into the soil at rate of about 1 cm per year.
According to https://chernobyl-tour.com/english/ ambient radiation in Pripyat right now is about 0.6 uSv/hr which is about 6 times normal background radiation or so. To put that in perspective, a dental X-ray will give you about 10 uSv.
There are hot-spots in the zone, particularly near Unit 4 and in places where radioactive cleanup equipment was dumped or radioactive dust was tracked in by liquidators. Tourists aren't be allowed near such places. They only bring people to places known to be fairly clean. Bringing tourists into unsafe areas is bad business.
You should check out bionerd23's YouTube channel. It's really interesting. She's a German researcher who apparently has permission to wander around the zone freely (including the places where the tours won't take you) and she makes some really fascinating videos. www.youtube.com/channel/UC966ccV08PVAmZRhcC0SU8Q
Personally, I've always wanted to go to Pripyat. It's an amazing place.1