InterNACHI Certified Radon Tester Practice Questions - InterNACHI Certified Radon Tester (Radon Measurement Professional) Exam

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Radon-222 is a naturally occurring radioactive gas. From which parent radionuclide in the U-238 decay series does Rn-222 directly originate?

Thorium-230 Radium-226 Polonium-218 Uranium-235

Correct Answer:

Radium-226

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