The state of Tennessee also announced that they approved the course here: http://www.tennessee.gov/environment/sustainable-practices_radon-program.shtml
Here is the free, approved, online radon course: http://www.nachi.org/radon-measurement-service-provider-online-course.htm
Tennessee also approved InterNACHI’s inspection courses for pre-licensing an continuing education: http://www.nachi.org/tennessee