[Deaf Smith]

"end up with radioactive sunflowers producing radioactive sunflower seeds as a by-product??"

A contractor is China will bid up the radioactive waste for disposal. That contractor will then subcontract out the work to a third party who will then clean, roast, salt and package the seeds. These will then be sold to a fourth contractor who will export them to the USA to be sold on grocery store shelves.

[incredulous joe]

You neglected to mention that it will be marked “organic”.