Using special evaluation and correlation circuits, the individual
types of radiation such as alpha and beta/gamma/X-ray radia-
tion are distinguished, separated and measured simultaneously
(patented by BERTHOLD TECHNOLOGIES). Part of the spillover of
alpha particles into the beta channel is corrected by software.
The advantages of this method are therefore:
high measuring accuracy
precise distinction of radiation types
high sensitivity even at low energies
low costs for the scintillator, and
ease of maintenance.
Results can be displayed either as a count rate (cps = counts
per second) or as area activities (Bq/cm²).
A metal grid protects the entrance window of the detector
against damage.
Currently, two scintillator probes are available: LB 1342 with
170 cm² surface and LB 1343 with 345 cm² surface. The pa-
tented correlation method allows to measure alpha and beta ra-
diation separately and simultaneously, without any additional
plastic scintillator, and with good efficiency and low local varia-
tion. The temperature dependence in the range -20°C to 40°C
is only about + - 10%. The dynamic range of the beta radiation
is 0 - 50,000 cps and for alpha radiation 0 - 5,000 cps.
Figure 7.1: LB 1342, scintillation probe with 170 cm²
(LB 1341, Xe gas probe in the same enclosure)
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