I think that a seeds hull would stop the alpha radiation from radon, but the live plants could receive sufficient dose to mutate the progeny. It seems some plants may sequester radon as well.
A UV-C sterilizer could work too. Ionizing radiation has a good track record for heritable mutations. I would be able to impliment a UV sterilizer in my current greenhouse.
A study on UVB/UVC radiation on seeds (mdpi.com)
I'm aware the "idea" is to radiate the seeds but to me it seems more plausible the parent plant is passing on its genetics based on its Epigenetics. In the reproduction cycle of one plant raised under "controlled conditions", you could expose it to an ideal amount of genetic distress that would cause a wide variety of offspring, an obviously beneficial response for a plant under that kind of stress... it would at least give some of it's descendants a very good chance at adapting to their controlled environment.
Start a controlled grow based on "your" ideal conditions. Start a ventilation system so you can control the environment for the benefit of the plants; Be able to divert it or turn it off when your working, for your benefit.
After one generation the diversity will be maximized and the best performing plants will be selected to pass their genes on... and so on... and so on...
Grow and select for whatever traits you're after. Cheers.
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