The Texture_Detail parameter does not have a direct physical representation. The blurring of the texture details is controlled by this value and it is not motivated so much by an appeal to real physics, since the Scatter node does not actually bounce light around inside the volume of the object. Rather, it's an approximation that requires you, as the artistic director of the production, to choose how you want the texture to be revealed as a subsurface effect, rather than a surface effect. If you notice the texture or color pattern looking too "painted on" then you probably want to decrease the Texture_Detail. I have experimentally judged that the legal values are from 0 to 1, inclusive. However, I found that negative (hypo) values or above 1 (hyper) values produce some "surprises" that an artist might actually find appealing. The hypo and hyper values produce what are properly called "artifacts" but if you like what comes out then cool, use it.

Here is a comparison of various Texture_Detail values starting with 1, then .5, .25, .125, .0625, and finally .03125. (The mathematically observant reader might notice I was using powers of 1/2).

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)