The increase in X-ray absorption by the epoxy/
barytes composites as a function of thickness and
weight fraction barytes is illustrated in Fig. 2. As
shown, the MoKa radiation was significantly attenuated
by the 40 wt % sample at a thickness of 0.4 cm.
Linear regression analysis of these results allowed
a determination of /~ for these composites. The
Pearson correlation coefficient for the least-squares
linear regression analysis was r ~ 0.999 in all cases.