Fission Chambers for In-Core Use CFUZ 530 pages

Product specification
CFUZ53
Neutron detector
1,5mm diameter in-core fission chamber
Application
Features
In-core measurements of flux range
up to 5x1014 n.cm-2.s-1 at 350°C
Sub-miniature watertight stainless steel
structure
Integral mineral insulated cable
Nuclear characteristics at 20°C
Sensitivity to thermal neutrons 1: Current mode
5x10-18
Neutron flux range 2:
2x1011 - 1014
Current mode
Gamma sensitivity:
max 7x10
Thermal neutrons 3
Gamma dose rate
Exposure limits at 350°C:
A/n.cm-2.s-1
-13
n.cm-2.s-1
A/Gy. h-1
20
max 1.5x10
max 107
n.cm-2
Gy.h-1
Notes.
Electrical characteristics
Unless otherwise stated, all characteristics are given at 20°C
4
Insulating resistance at 150V :
Nominal at 20°C
Detector +7m cable at 350°C
Operating voltage:
Nominal up to 350°C
Maximum at 20°C
Limit with no radiation
Cable:
Capacitance 5
Characteristic impedance
1
min 1012
8
min 10
Ω
Ω
100
150
400
400
8
V
V
V
pF/m
Ω/m
Materials:
Sensitive layer:
Case, electrodes
Insulator
Brazing
Uranium enriched in 235U
Mass
Filling gas (pressure)
Dimensions: Nominal diameter
Detector length
Overall length, on request 6
Sensitive length
Cable:
Type 7
External diameter
Insulator
Curvature radius 8
Connector:
Type 9
Insulator
Current mode operating range: the lower limit of the current mode
operating range depends on the electronics (especially on the
input amplifier) and on the signal / parasitic current ratio (parasitic
current = leakage current + gamma current + α-current). The
upper limit is depending both on the detector and electronics (loss
of linearity).
3
Flux corresponding to a 10 % sensitivity of the detector.
Stainless steel
(Co<0.05 %)
AI2O3
Copper
>90%
0.9
mg.cm-2
Argon (at 110 kPa)
1.5
mm
50
mm
max 30
m
10
mm
1 coax
1mm
AI2O3
min 20mm
4
The insulating resistance measurement includes the α-current.
5
The capacitance of the detector alone (10 pF) is negligible
compared with the capacitance of the cable.
6
Mechanical and physical characteristics
Detector:
Values depending on the characteristics and the calibration of the
measurement equipment.
2
The overall length (detector + cable + connector) constitues the
version code to be mentioned in the detector reference after the
basic type number. For example CFUZ53/15 indicates a detector
with a 15 m overall length.
7
Our "coax" cable is the 1 AcAc 10 referenced cable from
Thermocoax.
8
This is the smallest curvature radius allowing one reversible
deformation.
9
In order to avoid humidity penetration during storage, the
connector is closed with a cap to be removed just before use. As a
general rule, prevent any humidity penetration at the connection
level (refer to "Instructions for use and handling" in the package).
Other connector types are possible. To be required when ordering.
10
Including temperature increase due to gamma radiation (effective
above 104 Gy.h-1). Which is similar to the gamma flux within the
nuclear reactors.
BNC male
UG 260 D/U
PTFE
05/02/2008