You’re likely thinking about Stalker: Shadow of Chernobyl. I played it and a sequel (Call of Pripyat) recently on semi-modern hardware, but YMMV. I loved Stalker back in the day.

I haven’t personally tried it, but I’ve also been watching Chernobylite on Steam with interest. It seems like it may be intended to be a spiritual successor to Stalker. It’s been on sale recently, too.