Table 4.

Comparison of surface dose (D_s) values (%) of 6 MV photon beam for various field sizes cited in the literature with the present study

Study	Field size (cm2)
	5 × 5	8 × 8	10 × 10	10 × 20	15 × 15	20 × 20	25 × 25
Bilge et al.[16]a	10.0	*	15.0	*	*	23.0	*
Akbas et al.[17]a	10.8	*	16.6	*	*	28.1	*
Devic et al.[18]b	10.5	*	16.0	*	21.7	*	*
Sigamani et al.[19]b	12.0	*	18.0	*	22.0	27.0	31.5
Butson et al.[20]a,b	*	14.0	*	21.0	*	*	*
Ishmael Parsai et al.[21]c	10.5	*	16.0	*	21.5	*	31.5
Ishmael Parsai et al.[22]d	10.3	*	16.1	*	21.9	*	32.2
Apipunyasopon et al.[5]e	10.3	*	16.5	*	22.2	*	30.9
Present studyf	9.9	*	15.6	*	21.6	27.2	32.4

*Not quoted/measured. Measurements were done with following instruments/methods. ^aMarkus parallel plate chamber, ^bRadiochromic film, ^cExtrapolation chamber, ^dParallel plate chamber (readings applied with correction factor), ^eMonte Carlo simulation techniques, ^fCylindrical (CC13) chamber after applying the correction factor (“Ci [L]”)