ML23174A109

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Mirion Technologies, Fission Counter Chamber Dual-Range
ML23174A109
Person / Time
Site: Idaho State University
Issue date: 06/30/2023
From:
Mirion Technologies Corp
To:
Office of Nuclear Reactor Regulation
References
WL-6376A
Download: ML23174A109 (6)
v • d • e


Text

MIRION Fission Counter Chamber TECHNOLOGIES Dual-Range

Sensing Systems Division 1.4to 1.4x 105 nv Counter Range 6 x 105 to 1.4X 1010 nv Chamber Range 300°F(1500C) Operation 0.7cps/nv Counter Sensitivity13 Alnv Chamber Sensitivity 1.4x 10-Meets MIL-S-901 & MIL-STD-167 (Typ 1)

Tube Number: WL-6376A

Application The WL-6376A fission chamber is designed to detectthermal neutrons in the range of 1.4to 1.4x 105 neutronslD neut!cm2!second when operate as a counter and in the range of 6 x 105 to 1.4 X IO ronslcrn2!second when operated as a chamber. The detector is extremely ruggjd in construction, meeting MIL-S-901for shock and MIL-STD-167 (Type I)forvibration, and may beoperated in any position at temperatur sup to 300°F (l50°C).

The WL-6376A is constructed of aluminum, with high purity alumina ceramic insulators throughout, including those used in the typ~ HN connector. Intypical operation as a fission counter the WL-6376A has a thermal neutron sensitivity of approximately 0.7counts!neutro /cm2 throughout a wide range of applied voltage. When connected for service as an ionization chamber, the thermal neutron sensitivi is approximately 1.4x 10.13 amperes/neutron/cmvsecond with a gamma sensitivity ofapproximately 4.2x 10*1l ampereslRlhour.

Mechanical Diameter (50.8 mm) 2.00 Inches OverallLength (292mrn) 11.5 Inches Approximate Sensitive Length (152) 6 Inches NetWeight (794grams) 1.75Pounds Shipping Weight (5.4 kg) 12Pounds

Materials OuterCase : Aluminum Electrodes Aluminum Insulation A1203 Sensitive Material:

Amount ofU235 inU308 >90 %

Thickness ~ 2.0m'g/crn2 Gas Fill Ar-N Gas Pressure 76 crn-Hg

Impedance Resistance (minimum) (AtMax. Temp.) 10.9 Ohms Capacitance 150 pF

Maximum Ratings Voltage between Electrodes 1000 Volts Temperature (lSO°C) 300 OF ExternalPressure (Note 1) (7.0 kglcm2)100 psig Thermal Neutron Flux.3x 10lD nv

Typical Operation as a Connter (at approx. 25°C)

Operating Voltage 300 Volts Operating Voltage Plateau 200-800 Volts Thermal Neutron Flux Range 1.4to 1.4x 105 Volts Sensitivity (Note2) 0.7nv Output Pulse Characteristics:

Amplitude (unloaded) 2x 10-4 Volts InherentRise Time (average) 2 x 10.7 Seconds Tube Number: WL-6376A Page 2

Typical Operation as a Chamber (at approx. 25°C)

Operating Voltage (Note 3), 300-1000 Volts Thermal Neutron FluxRange (Note4) 6 xlO'5 to 1.4x 1010Nv Thermal Neutron Sensitivity 1.4x 10-13 Alnv Gamma Sensitivity 4.2x 10-11AlR/Hr AlphaBackground Current 1.6x IO-8A

Notes

1. The pressurizing atmosphere must bedry and non-corrosive.
2. The sensitivity given is with the alpha background counting rate ofthe naturallyradioactive uranium adjusted to 5 counts/second. By varying the pulseheight selectoron the associated circuitry, orbyuse ofhigh resolution circuitry, other sensitivities are available.
3. The minimum voltage required forsaturation is dependent upon the incident neutron fluxlevel.

4, The lower limitofoperating range is determined byan inherent alpha background current.

Document information is subjectto change without noticeand contains proprietary information which may not beaccurate.

Data Sheets - Marketing\\6376A Scanned 07113/09 I Uncompensated Ionization Chambers 3"Diameter -Guard Ring TECHNOLOGIES Tube Maximum Sensitivity Sensing Systems Division Type Temp. of A/nv

---.;1>--==-WL-6937 A 300 7.6 x 10.14 WL-7606 575 7.6 X10-14 WL-8075 300 7.6 X 10.14 WL-23272 300 3.3 X 10*]3

.Application This group of uncompensated ionization chambers is designed to operate in a thermal neutron to gamma flux ration of 104 IlVtoIRzbr or greater, These Chal1E~

feature guard-ling construction to minimize the effect of interelectrode leakage currents, They are extremely rugged and may be operated in any position up to eir rated temperature, The materials used in construction of file detector, including those of the type HN connectors, have been selected for low activation prope ies, This reduces the magnitude and duration ofact ivation currents and facilitates handling after exposure to high neutron fluxes.

-It Mechanical Units WL-6937A WL-7606 WL-8075 WL-2327 O.D., Nominal. Inches 3.00 3.00 3.00 3.00 Length, Nominal. Inches 13.62 13.62 13.62 21.50 Sensitive Length, Nominal. Inches 7.0 7.0 7.0 14.0 Net Weight. Pounds 2.5 2.5 2.5 3.75 Shipping Weight,. Pounds 10.0 10.0 10.0 11.5

Materials Outer Case...................................................;.................. Aluminum Aluminum Aluminum Aluminum Electrodes........................................................................ Aluminum Aluminum Aluminum Aluminum Insulation......................................................................... AhO, AhO) AhO) AhO)

Neutron Sensitive Material:

Content....................................................................... Boron (Bill) Boron (B'") Boron (B'o) BIOF)

Thickness................................................................... mg/cm2 0.8 0.8 0.8 Gas Fill....................................*....................................... Ar-Nz Ar-N2 AI'-N2 81°F3

Impedance Resistance, Minimum:

Signal Electrode to Case............................................ Ohms 1011 1011 1011 1011 H.V. Electrode to Case.............................................. Ohms 1011 1011 10-" 1011 -1 Capacitance (Notel):,

Signal Electrode to Case........................................... pF 170 170 170 180 H.V. Electrode to Case.............................................. pF 250 250 250 275

Maximum Ratings Voltage Between Electrodes:......................................... Volts d.c, 1500 1500 1500 2500 Temperature............................................................... OF 300 575 300 300 External Pressure (Note 2)........................................ PSI 180 180 180 180 Thermal Neutron Flux.................................................... llV 2.5 x 10" 2.5 X ro 2.5 X io" 2.5 X 10" Gamma Flux................................................................... Ribr [07 [07 107 107

Typical Operation Operating Voltage (Note 3)........................................... Voltsd.c. 200-1000 200*1000 200-1000 200-2000 Saturation Characteristics.............................................. See Fig. 6 See Fig. 6 See Fig. 6 See Fig. 5 Thermal Neutron Flux:

Lower Limit................................................................ nv 2.5 x 102 2.5 X 102 2.5 X 102 3.0 X 101 Upper Limit................................................................. nv 5.0 x 1010 5.0x 10'" 5.0 X 1010 5.0" 109 Thermal Neutron Sensitivity:

Reactor (Note 4)......................................................... Alnv 4.4 x 10.14 4.4 X 10.14 4.4 X 10.14 Source Box (Note 5)................................................... Alnv 7.6 x 10.14 7.6 X 10.14 7.6 X 10"4 3.3 X 1O-t)

Gamma Sensitivity: (Note 6)....................................... AlR/hr 4.0.x 10.11 4.0x 10.11 4.0 X 10 1.3 x ]0.1(1

NotesI. t Capacitance is measured between an electrode and case with all other electrodes grounded 10the case.

2. The pressurizing atmosphere mnst bedry and non-corrosive, 3'. The saturation voltage varies with CUITent level. See saturation characteristics for proper operating voltage.
4. The reactor sensitivity was determined experimentally. however perturbation effects may alter the effective neutron sensitivity.
5. The Thermal Neutron Sensitivity is determined in a Pu-Be source box. Reactor environments often produce significant flux perturbation which n.y alter the effective neutron sensitivity.
6. The gamma sensitivity is determined in a Co'" flux.

Uncompensated Ionization Chambers 3"Diameter - Guard Ring Page 2

Tube Maximum Sensitivity Type Temp. OF Alnv

~WL-6937A 300 7.6 x 10-14 WL-7606 575 7.6 X 10-14 WL-8075 300 7.6 X 10-14 WL-23272 300 3.3X 10-13

WL-6937A WL-760a WL-23272

WL-8075

(2) HN Jack.

(21 HN,Jocks Mal *** 1It1 Mole with MIL-\\IG 59AIU NIL-UC S9A/U Offllu}volcnl./

or~uf'tCltJlt.

/'

FIGURE 1 FIGURE 2 FIGURE 3

TYPICAL CONNECTION DIAGRAM WL*6937A RANGE CHART WL-7606 WL-B075

10'2 TYPICAL SATURATION CHARACTERISTICS

10'2 !mffittmtm !63A

JO-3A

FIGURE 4 -=

WL*23272 1)'P1CAL SATURATION CHARACTERIS11CS

3 cr~E!l~~ttti

[ 10- ~

~ I r;

i" IOIiA I !O-fIA Wl:6937 A---'WL-7606 600 1200 1600 2400 3000 1O-70~~~~~~~~~~~1~~~1~~ Wl:23272 WI:B075

AppJlad VOIiIi d.c.. Applied Volls de, CC..**.I2..'R A4 FIGURE 5 FIGURE 6 FIGURE 7

Document information is subject tochange without noticeand contains proprietary information which may notbeaccurate

Data Sheets - Marketing\\6937A 7606 8075 23272 Scanned 07128/11 Compensated Ionizafon MIRION Chamber TECHNOLOGIES Sensor and ControlDivision WL-23084

APPLICATION

The WL-23084 Compensated IonChamber is designed to operate in a thermalneutron to gamma fluxrat 0 of 500 nv to 1Rlhrwith 95% compensation. This chamber employs guard-ring construction to minimiz the effectofinter-electrodeleakage current,permitting operation from 230 nv to a maximum of5x1010 nv.1The chamber materials, includingthose ofthe type HN connectors,have beenselectedfortheir low activ tion properties. The use ofsuch materials reduces the magnitude and duration ofthe activation currents;and facilitateshandling ofthe chamber afterit has beenexposed to high neutron fluences.This chamb r is extremelyrugged and may beoperated in any position up to the rated temperature;however, operationian end-onfluxwillshiftthechamber's compensation characteristicand may alteritseffectiveneutron sensitivi I

  • MECHANICAL OutsideDiameter (nominal) 3.16Inches(79.4mm)

Length (nominal) 19.17Inches(486.9mm)

Sensitive Length (nominal) 14.0Inches(355 em)

{::S)HN JA(II;S H..I.T£W1TH NetWeight 5.7Pounds (2.6kg)

HIL-:)ti59 A/U DR EQuiVAL~IIT, Shipping Weight......................................... 19.0Pounds (9.6kg),@

MATERIALS OuterCase ;.Aluminum L Electrodes.Magnesium and Aluminum 2.0150.'1

  • Insulation.Alumina Ceramic Neutron Sensitive MaterialContent B-10 EnrichedBoron 2

Thickness (Approx.).0.8mgicm Gas Filling.Nitrogen (with Helium Trace) 191 :19 SEHSIfI\\1i (loSe. !;t..8

LEI"'GT""

IMPEDANCE [3:)5.61 1712.*.12 AP~RO;l;,

[1.50.1!J.o]

Resistance,minimum (Note1)

H.V ElectrodetoCase..... 1012 Ohms Signal ElectrodetoCase 1013Ohms Compensating ElectrodetoCase 1012 Ohms

es.re ~ Of)

Approximate Capacitance (Note2) 290pF {aO..3!J.5 SignaltoCase H.V. toCase 330pF Compensating ElectrodetoCase....... 182pF

MAXIMUM RATINGS Voltage betweenElectrodes........................ 1500 VoltsDC Temperature :............................. 400°F\\205°C)

Thermal Neutron Flux 5 x 101nv ExternalPressure(Note3) 180psig (12kg/ern')

WL-23084 10-31-2007 Compensated Ionization Chamber

WL-23084

Page 2

TYPICAL OPERATION Operating Voltage.300 to 1500 VoltsDC Compensating Voltage.-10to -80 VoltsDC Saturation Characteristics (Note4).See Figure 1 Thermal Neutron FluxRange 1.3x 103 to5.0 X 1010 nv Thermal Neutron Sensitivity Source Box (Note 5) 7.6 x 10"14 Alnv Reactor (Note 6) 4.4X 1O~14Alnv Gamma Sensitivity (Note 7)

Total Compensation 0AlR/hr Uncompensated 2.3x 10"11 AlRJHr

NOTES

1. The detectoris not designed forimmersion inwater. High humidity environments may degrade performance.
2. Capacitance is measured between an electrodeand case with all other electrodesgrounded to the case.
3. The pressurizing atmosphere must bedry and non-corrosive.
4. Saturation voltage varies with current level. See saturation characteristics forproper operating voltage.

I5. Thermal neutron sensitivity is evaluated using an AmBe source.

Reactor environments often produce significant flux perturbation which may alterthe effectivesensitivity.

6. The reactor sensitivity was determined experimentally. However, perturbation effectsand reactor spectrum may alterthe effective neutron sensitivity.
7. The gamma response is determined using a Co60 source.

WL-23084 10-31-2007

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