level, the extremely low background of 0.05 cps permits reliable
measurements of 0.1 µSv/h. The upper limit of the measuring
range is 100 mSv/h.
Technical data:
Unit of measurement: Ambient dose equivalent rate H*(10)
Measuring range: 30 nSv/h to 100 mSv/h
Sensitivity: 2.83 counts per nSv or 0.79 cps per
µSv/h
Background: 0.05 cps
Neutron energy range: Thermal to 20 MeV
Energy dependency: in the range from 50 keV to 10 MeV
± 30%
γ-sensitivity: <40 µSv/h up to to 100 mSv/h, Cs-137
gamma field
Temperature range: -10 to 50°C
7.6 Neutron Survey Meter LB 6414
The LB 6414 is a portable survey monitor for neutron radiation
with extremely high sensitivity. The energy-dependent response
probability is optimized for fission neutrons. There are many in-
teresting applications, in particular the search for plutonium.
Figure 7.13: Neutron Survey Meter LB 6414
The probe is particularly suitable to prevent illegal transportation
of plutonium across borders or in airports.
The following table shows the detection limit at 1m distance
from the source:
Measuring time Ex-weapons plutonium Reactor plutonium
1 s 303 g 67 g
10 s 47 g 10 g
100 s 12 g 2.6 g
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