Mirion Technologies SPN User 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 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 ux
distribution monitoring and monitoring of neutron
ux peaks
RELATED PRODUCTS
• KNK/KNU 50: neutron ionization chambers
• Proportional counter tubes BF3 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
Since norms, speci cations and designs are subject to occasional change, please ask for con rmation of the information given in this publication.
Mirion Technologies (MGPI) SA
Route d’Eyguières
FR-13113 Lamanon
France
T +33 (0) 4 90 59 59 59
F +33 (0) 4 90 59 55 18
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna, GA 30082
USA
T +1 770 432 2744
F +1 770 432 9179
Mirion Technologies (MGPI H&B) GmbH
Landsberger Strasse 328a
DE-80687 Munich
Germany
T +49 (0) 89515 13-0
F +49 (0) 89515 13 169
Mirion Commercial (Beijing) Co., Ltd.
Shanghai Jiangchang Commercial Branch
Room 801, 78 Jiangchang SanLu
Zhabei District, Shanghai 200436
PR of China
T +86 21 6180 6920
F +86 21 6180 6924
SPN DETECTORS
Neutron Flux Instrumentation
www.mirion.com
145028EN-B
348 244 EN-C
PREFERRED TYPES OF THE IST-PROGRAM
Notice: 1 nv = 1/cms
COMMON DATA
● Operating temperature: 400°C max. (752°F)
● Diameter of detector and cable: 1.6 mm
● Connector: BNC-Plug
● Material of detector and cable sheath: stainless steel
● Insulation: Al2O3 or MgO
● Manufacturer: Mirion Technologies (IST) Corporation,
Horseheads, NY/USA
Type Emitter
Material
Neutron
Sensitivity
(A/nv)
Gamma
Background
Measuring
Range
(nv)
Response
Time
(s)
Detector
Length L1
(mm)
Total
Length L2
(mm)
WL-23215
WL-23226
WL-23283
Rhodium
Vanadium
Cobalt
1.0e-20
1.1e-20
1.4e-21
2%
2%
5%
1e9 ... 1e15
1e9 ... 1e15
1e10...1e15
60
300
1e-10
76
1.321
864
8 543
9 144
4 877
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