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Featuring:
radiation monitoring
systems
A Mirion Technologies Division
KG 220 SEF
Detectors
KG 220 SEF
Gamma Ionization Chamber
The KG 220 SEF ionization chamber has been deve-
loped for low and medium range gamma dose rate
monitoring in nuclear facilities. There are two versions
with optimized energy response for measuring dose
rates in Sievert or Gray units. Gamma radiation pro-
duces charged particles (elctrons and gas ions) in the
gas lling of the ionization chamber. Their discharge
on the electrodes causes charge pulses. These
charge pulses are integrated to a DC current, which
can be measured in the external circuit.
The KG 220 ionization chambers may be connected
to signal processing units of the RAMSYS or TK 250
family.
APPLICATIONS
• Radioprotection of workers
○ Measurement of low and medium dose rates in
nuclear facilities for harsh environment conditions
RELATED PRODUCTS
• KG 50/51 SEC: ionization chambers for high dose
rates
• GIM 202K: medium range gamma area monitor
• TK 250: digital signal processing channels
FEATURES
● Wide measuring range up to 100 Gy/h or Sv/h
● Saturation proof
● Robust construction
● Long life time
● Energy range: 80 keV to 7 MeV
● Output signal: DC current starting at 0.1 pA
● Ambient temperature up to 120°C (248°F)
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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
KG 220 SEF
Detectors
TECHNICAL CHARACTERISTICS
www.mirion.com
144965EN-B
348 241 EN-C
Properties KG 220 SEF-Gy KG 220 SEF-Sv Tolerance Conditions
Measuring range 1e–7 Gy/h … 1 Gy/h
1 Gy/h … 1e+2 Gy/h
1e–7 Sv/h … 1 Sv/h
1 Sv/h … 1e+2 Sv/h
+5% / -20% acceptable deviation of sensitivity
+5% / -40% acceptable deviation of sensitivity
Sensitivity
Energy range
Radiation direction (>100 keV)
1.1e–6 A/(Gy/h)
80 keV … 3 MeV
±90° to main axis
0.9e–6 A/(Sv/h)
80 keV … 3 MeV
±90° to main axis
± 10%
± 25% acceptable deviation of sensitivity (IEC 60532)
± 40% acceptable deviation of sensitivity (KTA 1501)
± 20% acceptable deviation of sensitivity
Detector housing
Gas lling
Option: embedded source
Stainless steel, 4 mm
Argon, 32 bar
Cs-137, 185 kBq
Operating voltage
Break down voltage
Detector background current
Detector source current
1400 VDC
2500 VDC
1e-13 A approx.
8e-13 A approx.
± 5%
10 s max.
Ambient background
With embedded source
Temperature range
Short term temperature range
External pressure
Humidity
-30 … +100°C (-22 ... +212°F)
< 120°C (248°F)
0.7 … 1.3 bar
< 95%
1 h max.
Protection index IP67 and IK07
Dimensions (Ø × L, without cables)
Diameter of base plate
Weight (without cable and connector)
220 mm × 240 mm (8.7 in x 9.5 in)
280 mm (11 in)
Approx. 23 kg (51 lb)
Connectors Fischer size 105 Max. cable length is depending on signal processing
unit (cable capacity)
ACCESSORIES
● TKA 16: calibration source Cs-137 with lead housing and xture
● TKA 66: calibration source Cs-137 remote operated
● Connection cables: e.g. Raychem 5021B (low noise)
● Digital signal processing units:
○ TK 250 system: e.g. DPK 251 digital signal processing channel with c/f-converter NV 103
○ RAMSYS system: LPU-IC or LPDU-IC local signal processing units
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