DIADOS E
T11035
Operating Manual
– Performing a Measurement
30
D616.131.00/10 en
4.2.2 Positioning the Semiconductor
Detectors
Position the semiconductor detector for the selected
application. If you have selected the “Unatt.”
FILTER
setting, for instance, DIADOS E expects to
measure the dose in front of the phantom. If you
have selected the “Att.” filter setting, however,
DIADOS E expects to measure the dose behind the
phantom.
NOTE
Check that the semiconductor detector suitable
for the application is connected to DIADOS E
and that the appropriate calibration factor has
been selected with APPL and
ALT
+
FILTER
.
Otherwise DIADOS E will not be able to display
the correct values.
Using cassette adapter T20002
The detector is installed within the cassette adapter
which, in turn, is inserted in the holder for the image
receptor cassette (refer user manual of the detec-
tor).
If a suitable adapter is not available, a Velcro tape
can be used to install the detector in the X-ray path.
The Velcro tape should be attached on the back of
the detector for this purpose.
CAUTION
Improper handling.
Equipment damage!
Do not use tape with two adhesive sides be-
cause the detector is difficult to remove. Keep
the X-ray path clear of adhesive tape.
4.2.3 Starting the Measurement
Autostart:
DIADOS E is permanently in the Autostart mode.
This means that a dose measurement begins, as
soon as a signal is detected. Before, however, all
measuring values will be set to zero.
Dose rate measurement with the timer function:
The dose rate measurement begins 3 s after a dose
rate signal is detected (see section 1.5.10).
Manual start:
A dose measurement and the corresponding time
measurement can also be started with the START
key.
4.2.4 Display during the Measurement
The display is updated at 0.5 s intervals.
Normal mode:
Depending on your selection, the dose, the dose
rate or the measuring time will be displayed with the
ALT
key. With
ALT
you can toggle between the
displayed parameters during and after the meas-
urement.
Pulsed mode:
Depending on your selection, the dose, the dose
per pulse or the number of pulses will be displayed
with the
ALT
key. With
ALT
you can toggle between
the displayed parameters during and after the
measurement.
In the dose per pulse measurement, the device
determines the dose while counting the pulses. The
correct result will not be displayed before the end of
the series of pulses. During the measurement the
displayed values will be below the actual values,
but they approach the actual value with increasing
duration of the pulse series.
