Uni-Probe LB 490
BERTHOLD TECHNOLOGIES GmbH & Co. KG
6 – 633
Volume 6 6 Explanations
6
6 Explanations
6.1 Background
The term “background” refers to the count rate resulting from the
natural environmental radiation. The background level is largely
dependent on the scintillator volume. The background is not
accounted for by the decay compensation as it is regarded as a
constant.
An error when recording the background may later lead to drift
effects in the measurement. Influences from neighboring radiation
sources must be avoided.
Below we will present three options for measuring the background.
The best approach for your background measurement is dependent
on the situation on site and on the type of radiation source.
Best solution With empty or full tank, but without source shielding or without
having the source built in the shielding.
The rod detector must not receive any radiation from the closed
radiation shielding which has been put aside. To this end, the
shielding with the source has to be put in an adequate distance
(approx. 15m), or behind a thick concrete wall.
Figure 6-1 Best solution
Rod detector Rod detector
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