I thought that de radius of the strong force is about 1/r7. The elekctromagnetic and gravity force is with a radius of about 1/r2. I understand that for those last ones twice as far away gives a four times weaker radiation per surface and three times further away gives a nine times weaker radiation per surface. It is good to understand.
But how can you explain that such a strong force loose so fast of its strength? Does it have somthing to do with the fact that the gluons creating the force are so different from photons?