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As for resale value, it shouldn't have any effect. Some potential buyers might be concerned, but the response is: "Test this house for radon. You should consider testing any house for radon. Here, you'll know the levels are very low and there's a system in place to keep it that way."
Hope that helps.
Ask the seller to have a radon mitigation system installed at his expense. (doesn't hurt to ask). More often than not, they will do it. Because now it is a known fact, and they'll have to disclose it to any future buyers. So, it's in their best interests to go ahead and do it, make the buyer happy and get the house sold.
This situation can be fixed by mitigation if that is acceptable to you. For re-sale you will have to disclose that there was an issue with radon and the property has a mitigation system installed. Unfortunately this may cause some buyers to elect not to either view your home or make an offer. And if an offer is made it may be lower than other similar homes that don't have a radon issue.
All the best,