BERTHOLD TECHNOLOGIES LB 124 Scint Series - Count Rate Calculation

LB 124 Scint 8. Basis of Calculation
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8. Basis of Calculation
8.1 Count Rate Calculation
The LB 124 Scint updates the calculation of the raw data in
CPS (counts per second) every second, i.e. the succeeding
calculations are based upon intervals of 1 second.
General Formulas and Designations
t
Measured time [s]
I
T
Length of one interval (always 1s)
i
n
Counting pulses of the current interval
I
i
T
n
R =
Count rate (raw data)
b
R
Gross count rate (mean raw data)
1−
b
R
Gross count rate of the preceding interval
n
R
Net count rate
0
R
Background count rate
τ
1
=W
Weighting factor (depend. on the measurement
mode)
Formula abs. error rel. error
Gross count rate
1
*)1(*
−
−+
=
bb
RWRWR
12 −
=∆
τ
R
R
b
b
b
R
R∆
Net count rate
KRRR
bn
*)(
0
−
=
22
0
*
bn
RRKR ∆+∆=∆
n
n
R
R
∆
n
Integral of counts
min,b
R
Minimum gross count rate
max,b
R
Maximum gross count rate
For the averaging of the measured values, a moving average is
obtained using the formula:
1
*)1(*
−
−
+=
bb
RWRWR