45
2.3.6.5.2
Operating mode of the control unit “Display of measurement
results obtained from the probes or detectors” during DER measurement
2.3.6.5.2.1 When DER is measured, the control unit should be in the mode of
measurement results display obtained from the probes or detectors. The control unit
always enters this mode after being turned on. This mode can always be accessed
from any other mode by shortly pressing MODE.
“γ” radiation type should be set in this case.
Radiation
type
is
selected
(among the
allowable
for the connected
probe
)
with a long press
of
RAYS/RESTART.
Press and hold RAYS/RESTART
to
change the type of
radiation,
and then release
RAYS/RESTART.
If necessary,
repeat these steps
until
“γ” radiation is selected.
2.3.6.5.2.2 DER is shown in Sv/h (mSv/h, μSv/h) or Gy/h (mGy/h, μGy/h).
Display of pulse count rate in cps from the photon-ionizing radiation detectors is also
possible.
Shortly press UNITS to change the measurements units (2.3.6.4
of this OM).
2.3.6.5.2.3 In this mode the dosimeter’s LCD displays the following
(Figure 2.11):
- “γ” symbol (1) – radiation type under measurement;
- DER measurement result (2);
- DER measurement result dimension (3);
-
estimated limits of the expected relative statistical deviations (4) of the
measurement result (2) given 0.95 confidence probability – hereinafter referred to as
the specified limits of statistical deviations.
- indicator of instantaneous DER value (5).
- battery status symbol (6);
- navigation receiver status symbol (7);
- status symbol of registered gamma quanta, alpha or beta particles signaling
(8);
- symbol of alpha radiation presence (9) (when DER is measured using ABG
probe);
- sign (10) of critical filling of the nonvolatile memory of the dosimeter, where DE
accumulation history is stored (2.3.4 of this operating manual).
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