23
Operation threshold can be changed by setting a new
n
coefficient within 1.0 – 9.9 range.
N
coefficient influences the operation threshold value – the lower the
n
coefficient is, the higher
instrument sensitivity is. Note that the instrument false response rate increases at that.
Search mode of
- β- radiation sources enables the following, Figure 6.8 (4):
−
start measurement of count rate and DER – "Clear Statistic";
−
save measurement result into Spectroscopic Radiation Monitor РМ1403memory – "Save
To History";
−
switch sound alarm On/Off – "Sound On / Off";
−
do calibration ("Calibration"). When the "Calibration" line is selected, BDAB will
recalibrate, and then switch to the search mode automatically;
−
set detection threshold – "Thresholds".
6.3 BDAB settings
Select "αβ Detector [BDAB]" line, Figure 6.9 (1) in the Spectroscopic Radiation Monitor
РМ1403’s menu “Instrument Setting" to view or change BDAB settings.
"General" tab, Figure 6.9 (2):
−
read BDAB number;
−
allow/prohibit sound and light BDAB alarms.
"α Channel" tab, Figure 6.9 (3):
−
set the detection threshold of
- radiation sources – "Coefficient N". Setting range is 1.0 –
9.9, with 0,1 discreteness;
−
set alarm threshold for
- radiation DER – "Measurement Threshold, 1/(min*cm
2
)",
setting range is from 1.0 to 5∙10
5
min
-1
·cm
-2
.
"β Channel" tab, Figure 6.9 (4):
−
set detection threshold of β- sources – "Coefficient N". Its setting range is from 1.0 to 9.9,
discreteness 0.1;
−
set alarm threshold for β- radiation – "Measurement Threshold, 1/(min*cm
2
)", setting
range is from 10 to 10
6
min
-1
·cm
-2
.
1)
2)
3)
4)
Figure 6.9