1.2 LB 134 Probes
The integrated gamma dose rate probe LB 1346 is a Geiger-
Müller tube and is suitable for the low dose rate range from
0.1 µSv/h to 20 mSv/h and for an energy range from 50 to
1300 keV. Calibration factor: 0.625 µSv/h/cps, intrinsic back-
ground: 0.07 cps. The probe is calibrated to the H*(10) standard
(ambient equivalent dose rate). To extend the life of the batter-
ies/rechargeable batteries, the supply of the internal probe is
switched off in the menu when not in use.
Currently, the following probes can be connected external-
ly using a coiled cable:
LB-number Detector type Application
LB 1231 Proportional counter tube, Xe gas βγ contamination
LB 1233 Proportional counter tube, P10 gas αβγ contamination
LB 1234 NaI crystal, 1" γ activity, only cps value
LB 1238 End-window proportional counter tube αβγ activity
LB 1239 Proportional counter tube, P10 gas Tritium contamination
LB 6411 He-3 proportional counter tube Neutron dose rate
LB 6411-1 He-3 proportional counter tube, Neutron dose rate
reduced pressure
LB 1236-H10 Proportional counter tube γ dose rate
LB 6414 He-3 proportional counter tube Neutron search
LB 6386 P10 proportional counter tube, large-area αβγ contamination
LB 6376 Xe proportional counter tube, large-area βγ contamination
LB 1342 ZnS scintillation detector 170cm² αβγ contamination
LB 1343 ZnS scintillation detector 300cm² αβγ contamination
LB 1341 Xe proportional counter tube 170 cm² βγ contamination
More detailed probe data can be found in chapter 7. The follow-
ing important probe dependent parameters are stored in the pa-
rameter sets for each probe: Calibration factors, dead times, al-
lowed measuring ranges, alarm levels, units, fail thresholds and
more. The calibration factors for the contamination probes are
stored both for the older DIN 25415 standard as well as for the
more recent DIN ISO 7503 standard. The intrinsic background,
which is a detector property, is stored for the gamma dose rate
probes and should not be changed.
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