“…In the literature, skin dose measurement has been done with various available dosimeters (extrapolation chambers, parallel-plate chambers, radiographic or radiochromic films, and thermoluminescent dosimeters [TLDs], and metal oxide semiconductor field-effect transistors [MOSFETs]) for different types of beam geometries. [ 4 5 6 7 8 9 10 11 12 13 14 15 ] Although the extrapolation chambers with variable sensitive volume mass are best suited for accurate measurement of absorbed doses in the near surface of the medium, their unavailability in the present institute has led to the Markus type parallel-plate chamber to be chosen for surface dose measurements. [ 16 ] Due to its thin entrance window, less perturbation toward primary photon beam and electron contamination, and fixed electrode separation, parallel-plate ionization chambers are also suited for surface and buildup region dose measurements instead of extrapolation chambers.…”