Giant Behemoths make beeping computer sounds. Jellyfish stings or kelp abrasions combined with an allergic reaction can look like third degree burns. Loosely wrapped Ace Bandages must be cut off. Jet aircraft make propeller sounds. Radiation, mysterious as ever, will burn people to a crisp but leave hay untouched.
Dinosaurs swim, project electricity, and are radioactive.
Radar can see everything, above or below water - except a giant radioactive dinosaur. Flares on the water's surface make good effects for torpedo hits on submarine Behemoths. Now that is a darn ugly fish you've caught Tom. As to the radioactivity of the thing there can be no doubt. The Behemoth roaring.