Daredevil is a walking Geiger counter.
By the man's own admission.
In Daredevil #43 (1968), after Karen Page decides to walk away from him, a heartbroken Daredevil begins to storm the city, looking for a bad guy to lash out on. He first settles on beating up the Jester, but intercepts a radio call announcing the theft of radioactive vials.
He then proceeds to use his "hyper-keen senses", which make him a "walking Geiger counter", in order to "sniff the thief out". Indeed, upon approaching the villain, Matt feels "a strange, burning sensation".
This radiation affects him very quickly, and later driving him a tad bit mad, going up in a boxing match against Captain America. Daredevil suspects it has to do with the accident that made him blind, namely his eyes being spread with radioactive material fallen from a truck.
As to how exactly he detects the radioactive material, it's not precised if it's the radiation waves, the pressure... But to be perfectly honest, I think 60s comic book writers were even more clueless about radioactivity properties than I am.
He can also identify radioactive heat
In Daredevil #1 (2014), while helping out some forensics in a kidnapping matter, Matt Murdock is able to detect a particular warmth coming from a piece of paper, and identifies it as "a minute level of residual radioactivity". Not really radiation pressure, but still a defining radiation characteristic.
And of course, usual comic book rules apply. Daredevil can hear a heartbeat over an early-2000s cellphone (Daredevil #38, 2002), he can read a newspaper due to how the ink feels under his fingers (lots of instances), he can anticipate a phone call (Daredevil #184, 1982)...
So, if the writers need him to be able to feel radiation pressure, he'll be able to do that.