On the X-Ray Reflectivity by Poly Allyl Diglycol Carbonate (PADC)

X-ray reflectivity via the poly allyl diglycol carbonate (CR-39 polymer sheet) was investigated. X-ray reflectivity was measured for a pristine and a chemically etched CR-39 detector in 6.25N NaOH at (70 +/- 0.5) degrees C for different durations. Far from the spectral peak, the reflectivity of the CR-39 polymer sheet has a wide peak at 2 theta = 20.1 degrees, and its intensity is decreased by increasing the etching time. Moreover, the integrated counts under the peaks, C(t(e)), vary linearly as a function of the etching time te. Data are fitted using a linear function C(t(e)) = A + Bt(e), with fitting parameters A = (3271 +/- 170) and B = (-960 +/- 84). The reflectivity deterioration is attributed to the increase of CR-39 surface's roughness due to the chemical etching. The rocking curves of X-ray reflectivity were measured for a pristine and an etched CR-39 polymer sheet. Specular reflections are observed, as well as Yoneda wings, which broaden and move away from the specular reflections due to the increase in the CR-39 surface's roughness.