--- Exp time(min)= SFD(CM)XSFD(CM)XFILM FACTORX2 exp(JOB THK(MM)/12.5)X60/(source strength in cix.5x100x100) sfd source to film distance in cm film factor from film manufacturer D7-1.1 D4 -1.1 etc n= job thk/12.5 (hvl of steel 12.5mm) ci strength in ci (souce strength) for Ir 192 .5 R/hr for ss exp time is 30% more than c.s exp time.(as thumb rule) |
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