38477BA2B
6 – 642 25.5.09
6 Explanations Volume 6
Figure 6-10 Calibration curve
All count rates for each calibration point are adjusted automatically
by the following formula.
cps
new
= (cps
old
- Bq) * (cps 0%
new
- Bg) / (cps 0%
old
- Bg) +
Bg
cps
new
: new calculated pulse rate
cps 0%
old
: new pulse rate at 0%
cps 0%
old
: old pulse rate at 0%
cps
old
: old count rate
Bg
: Background
Example from the table at 70% cps 0%
old
: 5000cps
cps 0%
old
: 7000cps
cps
old
(70%): 3000cps
Bg
: 100cps
cps
new
= (3000-100) * (5000-100)/(7000-100) + 100 = 2159 cps
Level in % Count rate in cps
0 5000
40 3580
70 2159
100 171
CPS
Level
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