User manual
132
From the data in Figure B-1, it is calculated that at time-after-exposure of 30 minutes, a
5-minute timing difference could contribute to a dose error of about 0.3%, while a 10
minute timing difference could contribute to a dose error about 0.6%. As time-after-
exposure increases from 30 to 60 minutes the dose error contributed by a given timing
difference decreases by a factor of two. To ensure that time-after-exposure differences
have a small contribution to dose error i.e. (<0.5%), film scanning should be delayed for
a time period at least 4X longer than the interval between exposure of the first and last
calibration films. For example, if exposures are within a 5 minute time window, scanning
should be delayed for 20 minutes, or done at any time thereafter.