I agree with John. Radon in Cary is not much of an issue. Now if you live up in Rolesville ( NE Wake County)where I do, then YES it can be. Plus parts of Wake Forest and pockets in North Raleigh.
I get sent Radon test kits every 2 years as I have a basement in my home.
Radon in a naturally occurring out of Granite bed rock
Radon can vary from area to area and house to house. Depends on the topography the underground conditions, type of foundation etc. Test to be sure... a canister test is OK, a computerized test is better.
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I can recommend a licensed mitigator if you find you need one or most licensed inspectors can provide radon testing. You can also do a "screening" with an over the counter kit from most builders supplies for about $60 which takes several weeks.
For more information about Radon in Wake county I recommend visiting the site
You can also contact the State Radon Officer:
Division of Radiation Protection
3825 Barrett Drive
Raleigh NC, 27609-7221
Radon is unique in that your naeighbors house may not have a high level but your home could for some unknown reason. I do not believe that it is extremely prominant in Cary, however I am not a professional Radon tester. I recommend having the test completed, it is inexpensive considering the peace of mind you will have!
Best of luck!