Table 7.1: Nominal operating ranges of LB 1236-H10, tested
by the PTB in Braunschweig
7.5 Neutron Dose Rate Probe LB 6411
The LB 6411 neutron probe is designed for measurement of the
ambient equivalent dose of neutron radiation as recommended
by the International Commission on Radiological Protection
ICRP of 1991. It was developed within the framework of a tech-
nology transfer project supported by the Department of Dosime-
try of the Research Center Karlsruhe (KIT). The probe was op-
timized with respect to the energy response in accordance with
the new equivalent dose conversion factors by ICRP 60. The
LB 6411 neutron probe can be used both as a portable monitor
and as a stationary measuring device. Major areas of applica-
tion are in the nuclear field in reactors and the nuclear fuel cy-
cle, in the field of research in accelerators and in the industrial
sector in the use of neutron sources.
Figure 7.12: Neutron Dose rate Probe LB 6411
The LB 6411 probe consists of a moderator sphere made of PE
with a composite
3
He recoil proton counter tube at its center.
The probe also includes the high voltage supply and a pream-
plifier. It can be connected directly to the LB 134 UMo II. In the
energy range between 1 and 10 MeV the sensitivity is about 3
counts per nSv.
Measuring range
For 0.1 µSv/h the count rate related to a neutron energy in the
range of 3 MeV is about 0.1 cps. At about 0.1 µSv/h ambient
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