The materials that are used in the energy loss corrections that we apply 
to the data are:

(note that "mil" refers to 0.001 inches, not 1 millimeter)

Corrections to incident beam energy:
1)Scattering chamber entrance window: 15 mil Aluminum foil
2)Target cell entrance window: 8mil Beryllium foil
3)Water foils:
The foil thickness used were:
foil 1: 0.281 cm
foil 2: 0.290 cm
foil 3: 0.234 cm
The correction is always applied making the assumption that the electron 
scattered at the center of the foil. The foil thickness numbers were taken 
from page 10 of:
http://www.jlab.org/~fissum/e00102/analysis/e00102_status.pdf
This is the thickness along the direction of the beamline, not the minimum 
thickness of the foil.

Corrections to scattered particle energy:
1)Water foils: see above. As with the incident beam correction, the 
scattering is assumed to always take place at the center of the foil.
2)Target cell side walls: 3 mil stainless steel

Kevin has posted drawings of the target box and scattering chamber on the 
E00102 website:
http://www.jlab.org/~fissum/e00102/target/target_cell.pdf
http://www.jlab.org/~fissum/e00102/target/scattering_chamber.pdf