iaea human health series publications - SEDIM

TABLE 18. PRODUCT OF CONVERSION FACTORS g AND c FOR CALCULATING D G FOR STANDARDBREASTS FROM MEASUREMENTS WITH DIFFERENT THICKNESSES OF PMMA PHANTOMPMMA thickness(mm)Equivalentbreast thickness(mm)Fibroglandular proportionof equivalent breast(%)Product of g and c factorsHVL (mm Al)0.30 0.35 0.40 0.45 0.50 0.55 0.6020 21 97 0.336 0.377 0.415 0.450 0.482 0.513 0.53930 32 67 0.245 0.277 0.308 0.338 0.368 0.399 0.42740 45 41 0.191 0.217 0.241 0.268 0.296 0.322 0.35145 53 29 0.172 0.196 0.218 0.242 0.269 0.297 0.32150 60 20 0.157 0.179 0.198 0.221 0.245 0.269 0.29660 75 9 0.133 0.151 0.168 0.187 0.203 0.230 0.25370 90 4 0.112 0.127 0.142 0.157 0.173 0.194 0.21580 103 3 0.097 0.110 0.124 0.136 0.150 0.169 0.188TABLE 19. s FACTORS FOR SELECTED TARGET–FILTER COMBINATIONSTarget–filter combination Filter thickness (μm) s factorMo/Mo 30 1.000Mo/Rh 25 1.017Rh/Rh 25 1.061W/Rh 50–60 1.042W/Ag 50–75 1.042TABLE 20. s FACTORS FOR TUNGSTEN TARGET FILTERED BY 0.5 mm OF ALUMINIUM [67]PMMA thickness (mm) Equivalent breast thickness (mm) s factor20 21 1.07530 32 1.10440 45 1.13445 53 1.14950 60 1.16060 75 1.18170 90 1.19880 103 1.208114