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count rate of the background ratemeter according to the fol-
lowing empirical equation:
=
+
As
1
Cnt
n
where As1:
Cnt:
T:
n:
The alarm threshold As1 is next compared to a minimum
count rate to alarm value As(min).
Condition
As1 ≥ As(min)
As1 < As(min)
Recommended Sigma value and As(min) settings:
Sigma = 6 enables almost false alarm free searching in areas
with a fairly constant radiation background.
For general use, especially in an urban environment the setting
of a As(min) in the range of typically 20cps – 60cps is rec-
ommended to avoid false alarms from certain natural materi-
1
als
. The factory setting
1
Frequently paving stone and plates made from granite contain sub-
stantial traces of Uranium and Thorium.
2
Please note that the value for As(min) can't be changed in the
RadEye's menu, but requires the RadEye a PC connection and the
software RadEye.EXE. As(min) is named in the software "Sigma
min Range [cps]". Please refer also to chapter 6.4.3.
RadEye PRD-ER
Iw/Tr/Ff 06.07.2015
⋅
⋅
+
Cnt
T
80
Alarm threshold 1
Count rate of the background ratemeter
4 s, Time of measurement sliding window
sigma value set between 2 and 9
Active alarm threshold 1
As1
As(min)
2
for As(min) = 30 cps.
DB-066 E
/
T
3-9
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