. . . . . . . . . "Diffusion Coefficient for Fluence Rate"@en . . . . . . . "http://en.wikipedia.org/wiki/Mass_diffusivity"^^ . . "D\u1D69" . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31895"^^ . . "m" . . "The \"Diffusion Coefficient for Fluence Rate\" is a proportionality constant between the ." . "\\(D_\\varphi = -\\frac{J_x}{\\frac{\\partial d\\varphi}{\\partial dx}}\\), where \\(J_x\\) is the \\(x-component\\) of the particle current and \\(\\varphi\\) is the particle fluence rate."^^ . . . . . . . . . . . . . . . . . . .