That's not much of a debunking. What did Talk Origins do?
They questioned one of Gentry's assumptions. And they proposed without any proof or evidence, an alternative and possibly plausible explanation for the origin of the halos other than plutonium. That fair, but hardly debunks it. It simply indicates more research is needed.
They resort in the end to "this contradicts the vast amount of research saying the earth is old" so Gentry must be wrong. But there is not much research to support an old age earth that does not have numerous questions about it's underlying assumptions.
And the research continues.
To their credit - at least they recognized his credentials and didn't slander the man, which is more than I can say for some of the posters here. They may have disagreed with his conclusions, but at least gave him some respect.