c. Place the lead identification number "60" on the top surface of the
phantom (see figure 4-22).
d. Insert a cassette in the Bucky tray and close the Bucky tray.
e. Make the AET exposure.
f. Record the information in the appropriate section of the form.
g. Repeat steps a--f using 80, 100, and 120 kVp.
Be sure to change the cassette and lead identification numbers when
changing kVp's (see figure 4-23).
h. Process four films.
Figure 4-22. Note the "A" identification marker placed on
the phantom prior to the first exposure.