the thing I would like to emulate is the white line of light inside the object that shows throw the translucence.
If I put a light or a self illuminated object inside the main object (which has subsurface scattering) won´t work.
Thanks! this technique is great! although it doesn't allow to place the gradient whatever you want, it's great to generate an effect of gradient going from the center of the object to the edges. Nevertheless I used a simple gradient placed in the the polygon and so far it works... the only thing is that doesn't look exactly like the reference because it overrides the edges of the object, painting all along the geometry as if were outside, not inside.