Spend the money on a digital monitor. We had one of the pucks sent by Health Canada, found out our basement had extreme levels (as high as 600-900 Bqm^3). The digital monitor shows the big trends. We had some equipment installed to remediate it, so it's better... But we'll be doing more work next year to try to reduce it even further.
The only thing worse than finding out how bad it was, was not knowing about it for 10+ years. This whole thing has likely reduced the life expectancy of my family.
Most parts of eastern Canada have comparatively high levels of Uranium in the ground - the radioactive decay process turns Uranium into Radon, which finds its way into buildings, and collects in basements because it's heavier than air. It's been made worse by the whole "R2000" building standard which means homes are practically air tight.
The worst part is that federal and provincial building codes don't make the installation of radon remediation equipment standard -- and it costs practically nothing to install at construction time -- whereas cutting trenches in your foundation to install PVC pipe is extraordinarily disruptive.