Fluke Biomedical 10100AT - Manual (Page 42)

10100AT
Operators Manual
2-24
Simultaneous kVp determinations can be done while measuring exposure per frame. See section 2.6.4
for general information.
2.11.4 Making Mammo kVp Measurements
This section follows the recommendation that the Linear Mammo Filter Pack be used in conjunction with
the Cadmium K-edge Filter Pack. The Model 35050AT will automatically apply corrections based on the
k-edge measurement.
The operator should read the mammographic filter pack sections of the Model 35080/80A/80B kVp
Divider Instruction Manual to become familiar with the specifications, theory of operation, and application
of corrections for these filter packs. Also see section 2.6.4 of this manual for instruction on using the
Model 35050AT Dosimeter as a readout for the Model 35080/80A/80B kVp Divider.
The following procedure requires the ability to select the k-edge and linear mammo filter packs using the
DETECTOR SELECT button. Press the DETECTOR SELECT button to display the name of the filter
pack installed. The cursor ‘>’ should be the left most character on the bottom line of the display. If not
press, the DETECTOR SELECT button again. To scroll through the available filter packs, use the UP or
DOWN buttons. Stop scrolling when the desired filter pack name appears on the display. If the desired
filter pack name does not appear, the instrument must be customized. See the customization manual for
details.
The two-exposure method of k-edge kVp determination precludes any combined exposure RATE
measurements. Therefore, if units of exposure rate, exposure per frame, or current are selected with the
K-edge Filter Pack, the following error message will be displayed:
Select units of either charge or dose (C, R, Gy, or Sv). Although the Model 35050AT Dosimeter has the
capability to do a combined exposure dose, kVp, and time measurement, the distance and beam
limitations on mammographic generators make this impractical. Therefore, the Model 35050AT
Dosimeter will only display the kVp and time.
2.11.4.1 Cadmium K-edge Filter Pack Use
1. K-edge Measurement Setup: Install the Cadmium K-edge Filter Pack in the Model 35080/80A/80B
kVp Divider. Place the kVp divider in the x-ray beam on the compression paddle or other suitable
support with the long axis of the kVp divider perpendicular to the axis of the x-ray tube. Raise the
kVp divider as close as possible to the x-ray tube. The x-ray beam should cover the entire filter
pack. Select the K-edge filter pack using the DETECTOR SELECT button and the UP or DOWN
button on the Model 35050AT Dosimeter. Press the RESET/MEASURE button. The display
should show the following message:
2. 25 kVp Measurement Procedure: Set the x-ray generator for 25 kVp and 100 mA. If not
available, use at least 50 mA and a minimum time of 50 ms or a mAs setting that provides these
tube currents. Select the molybdenum (Mo) filter on the generator. Make an exposure. A
message similar to the one below will appear.