Mirion Technologies SPN - Manual

Featuring:
radiation monitoring
systems
A Mirion Technologies Division
SPN DETECTORS
Neutron Flux Instrumentation
SPN DETECTORS
Self-Powered Neutron Detectors
SPN-detectors are designed for the detection of
thermal neutrons within the core of the reactor. These
detectors generate a current proportional to the
neutron fl ux density without applying an external
voltage source.
In general, the detector current of these detectors is
caused by the emission of beta radiation (electrons)
from the target material which gets activated by
neutrons. Therefore, besides the name SPN-detector
(Self-Powered Neutron detector), also the name n,ß-
detector (neutron-beta-detector) is in use.
APPLICATIONS
• Operational process monitoring
○ Detection and measurement of the thermal
neutrons inside the reactor core for neutron fl ux
distribution monitoring and monitoring of neutron
fl ux peaks
RELATED PRODUCTS
• KNK/KNU 50: neutron ionization chambers
• Proportional counter tubes BF3 fi lled
• TK 250: digital signal processing channels for
start-up and power range
FEATURES
● Detection of thermal neutrons within the reactor core
●
WL-23293 with co-emitter: short response time
● Small dimensions, proven construction
●
Large measuring range up to 1e15 nv
●
Output signal: DC-current
●
Very low gamma sensitivity