In the sense that the difference between your understanding and my understanding of the energy released in the nuclear reaction may be compared.

You said:
"I don't have a good analogy for it, but you can think of iron oxidizing as rust, versus iron burning in a sparkler. Same process, different rates."

As I understand; the iron that rusts in air or burns in oxygen, releases the same amount of energy, only the time duration is different.

Is that your understanding of the nuclear energy exchange?

In other words the total amount of energy that is released is the same regardless of the time period. (As in natural or reactor induced radiation.)

The "sparkler" reaction is different, and in my opinion somewhat closer to an analogue of the nuclear reaction.

I think that the sparklers are a form of thermite. Thermit is a combination of two metals and oxygen, when the mixture is heated sufficiently, a chemical reaction starts that gives out a tremendous amount of heat. The thermit reaction is much hotter than the flame of the match that started it.

In a somewhat similar fashion, the nuclear fuel must be heated by concentrating the internal effects to a degree where the chain reaction begins.
Once the chain reaction starts, the energy output is greater in intensity than the energy that initiated the reaction.

The difference between the two reactions is that the nuclear fuel remains hotter far longer, that is, it emits (kinetic) energy for a far longer period of time, and this (magnified) energy is absorbed by the surrounding molecules, giving them more kinetic energy.
Somewhat like striking a match and starting a forest fire with it, except in the nuclear case the resulting fire is much hotter than the match.

If we urinate in Lake Tahoe the good thing is that the liquid would still remain on Earth, whereas IF a cup of air escapes into space we will never see it again.
I think that there should also be a watchdog agency that would inform everyone when someone expels a cup of atmospheric molecules into space.

There is some information that is relevant to this discussion at this site:

http://science.nasa.gov/newhome/headlines/ast09dec97_3.htm

"We're not starting with a solar wind particle at 1 keV," Chappell sad, "but with atmospheric particles at a few eV. They make up everything you see up there."