15
increase as the instrument moves closer to a
radiation source. The number of false alarms
depends on many factors including changes in the
ambient background radiation level as well as
changes to the system setup.
2.3.2. “Mode 0…9”
In this mode the instrument displays the current
level of gamma radiation background in form of
digits from 0 to 9. Each digit represents the certain
DER range:
Indicated
digit
Dose
equivalent
rate range in
µ
Sv/h
Dose
equivalent
rate range in
mrem/h
0
≤
0.37
≤
0.037
1
0.37 - 0.45
0.037 - 0.045
2
0.45 - 0.59
0.045 - 0.059
3
0.59 - 0.90
0.059 - 0.090
4
0.90 - 1.20
0.090 - 0.120
5
1.20 - 2.50
0.120 - 0.250
6
2.50 - 5.82
0.250 - 0.582
7
5.82 - 9.58
0.582 - 0.958
8
9.58 - 23.50
0.958 - 2.350
9
≥ 23.50
≥
2.350
In the lower part of the LCD is situated the analog
bar, which represents the degree of the Search
alarm threshold excess.
Radioactive source localization may be performed
by monitoring of the numerical value and analog
bar on the display. The closer the instrument is to
the radiation source, the larger the value is and the
more segments of the bar are filled.
