Fiction novel/short involving dinosaurs who fed off radiation, involving dropping nuke on them

I’m searching for a novel, or maybe it was a short story. I read it before the year 2000. It was in Russian, but I suppose it was translated from English. Can’t recall any of the names though.

The plot, in parts I can recall, was:

• people find either a dinosaur egg, or baby dinosaur, or a similar large reptile-like;

• these dinosaurs or whatever walk around Earth feeding off radiation. They actually eat radioactive stuff and leave no radiation behind; I recall at one point one of the human characters says something along the lines of “looks like we have our nuclear waste problem solved”;

• people try to kill these dinosaurs but fail; and at one point there is a plan to drop a nuke on them. And at this point I had to stop reading and leave.