Berthold LB 134 - 11.3 Calibration Factors for LB 1341 (Xenon detector)

LB 134 9. Basis of Calculation
119
Basis of calculation:
Designation
Variable
Unit
Default
Parameters
Time constant (preset time)
c
T
[s]
10
Sigma factor
S
5
Nuclide (with calibration factor K)
K
Net
Preset time constant:
t
W
1

for
c
Tt 
c
T
W
1

for
c
Tt 
Reset and recalculate of
W
,
t
and
b
R
if
bb
RSRR *
9.4 Counter/Timer Function
In the Counter/Timer mode, all measured values in a given time
interval are combined to form an arithmetic average.
There are three stop criteria for the time interval:
a) Time: Here the measurement runs until the set time in sec-
onds is over.
b) Accuracy: Here the criterion for the end of the measure-
ment is given by the achieved relative accuracy in %: ( =
100 /
n
), n = number of counts
The preset values (time: 120 s, counts: 1000 s, accuracy: 3.0%)
have to be adapted accordingly to the requirements of the
measurement.
Absolute statistical error:
0
0
T
R
t
R
R
b
n

t
elapsed measuring time