Operating Manual – Description of the Device
Figure 5: Timer function
At the end of the measurement, the dose rate aver-
aged over the timer interval will be indicated.
Purpose of the timer interval “2 s”:
You will select the 2 s timer interval if DIADOS E
is to continue indicating the dose rate after radia-
tion has been removed (when the timer is off, the
dose rate displayed after removal of radiation is
0.0).
Measuring tasks:
a) Display of the dose rate value after removal
of radiation:
Recommended timer interval: 2 s (selection in
the Setup menu). DIADOS E starts averaging
3 s after a dose rate signal has been detected,
the displayed time blinks. The dose rate signal is
required for another 5 s at minimum. The dis-
played time stops blinking and DIADOS E stores
the measured dose rate values which are aver-
aged over 2 s in each case. When radiation is
removed, DIADOS E will display the dose rate
value measured 3 s before removal of radiation.
b) Determining the Average Dose Rate Over a
Period of 20 s:
The timer interval shall be set to 20 s (selection
in the Setup menu). DIADOS E starts averaging
3 s after a dose rate signal has been detected,
the displayed time blinks. The dose rate shall
now be maintained constant until the time dis-
played on DIADOS E stops blinking (this is the
case after another 23 s). Radiation can now be
removed. DIADOS E will display the dose rate
averaged over the last 20 s of fluoroscopy, while
ignoring the last 3 s.
If the dose rate signal ends while the displayed
time still blinks, the average is calculated on the
basis of the existing values (with the exception of
the first and last 3 s) and the corresponding
measuring time is displayed. If the irradiation
time is less than 6 s, DIADOS E will indicate a
measured value of zero for dose rate, dose and
time. The dose is calculated on the basis of the
average dose rate and the irradiation interval.
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