irect calculation of the cross-sections for thick samples in this experiment is
hardly feasible, especially for the “foam + liquid” samples which are not “homogenous
mixtures”. On another hand, the unique structure of the foam and “foam + liquid” samples 104
and the polyenergetic property of the thermal neutron beam complicate the total cross-section
calculation. For the purpose of the work in current stage, the transmission (T) was
determined from the experimental results and some analyses were made.