User Manual

Featuring:
radiation monitoring
systems
A Mirion Technologies Division
KNK/KNU 50
Neutron Flux Instrumentation
KNK/KNU 50
Neutron Ionization Chambers
The KNK/KNU 50 neutron ionization chambers are
designed for neutron  ux monitoring in ex-core
positions. The neutron sensitivity of these ionization
chambers is achieved by the coating of one electrode
with enriched boron-10. Thermal neutrons react with
the isotope boron-10 emitting alpha particles, which
produces ionization in the gas within the detector.
Their discharge on the electrodes causes charge pul-
ses. These charge pulses are integrated to a DC cur-
rent, which can be measured in the external circuit.
APPLICATIONS
• Operational process monitoring
○ Measurement of the neutron  ux densitiy outside
the reactor core for power reactors and research
reactors in the intermediate range (KNK 50) and
power range (KNU 50)
RELATED PRODUCTS
• Proportional counters BF3  lled
• Self-powered neutron detectors
• Digital signal processing channels for start-up and
power range
FEATURES
● Wide measuring range
● Simple and rugged construction
● Saturation proof
● Large and steady sensitive length
● Output signal: DC current starting at 1 pA
● Compensation of gamma radiation (KNK 50)
● LOCA proof (KNK 50 SAC)