Thanks patiodog. That's excactly what I need to know. I bookmarked the link, and it will undoubtedly be closely scrutinized.
The link you provided states that the higher the number, the flatter the fretboard. Makes sense. The fretboard is thought of as a section of a circle. The bigger the circle, the flatter the section that is the width of the fretboard would be.
My telecaster has a radius of 7 1/4". Bending is ok, but I'm building a strat (assembling it from parts), and it will have a 9.5" radius.