CT Ion Chambers

Specifications for 10 cc high sensitivity
Detector type Vented air ion chamber
Volume 10.1 cc
Sensitive length 10.0 cm
Chamber material Acrylic (PMMA)
Chamber outside diameter 0.5 in ± 0.015 in
(12.7 mm ± 0.4 mm)
Chamber inside diameter 0.45 in (11.44 mm)
Chamber wall thickness 77 mg/cm2
Electrode material Aluminum, 1100
Sensitivity 3.2 R•cm/nC (nominal) or 0.3/nC
Standard calibration 100 kVCP, 5.5 mm Al HVL (NIST Tech. M100)
Response uniformity along axis ± 3% over central 90% of active length
Beam orientation Normal to chamber axis
Leakage current (300 V collection potential) Less than 10-14 A at 10 min polarization time

10 cc High Sensitivity Ion Chamber Graph
Intensity Limits Continuous beam: 31.6 R/sec, (1% recombination loss)
Pulsed beam 15.8 mR/pulse (1% recombination loss)
Collection time 0.478 mSec
Cable length 3 ft (0.9 m)
Operating voltage 300 V





Specifications for 3.2 cc
Detector type Vented air ion chamber
Volume 3.2 cc
Sensitive length 10.0 cm
Chamber material Polystyrene
Chamber inside diameter 6.4 mm
Chamber wall thickness 54 mg/cm2
Electrode materia Aluminum
Sensitivity 10 R•cm/nC (nominal)
Standard calibration 100 kVCP, 5.5 mm Al HVL (NIST Tech. M100)
Response uniformity along axis ± 3% over central 90% of active length
Beam orientation Normal to chamber axis
Phantom adapter OD 1.27 ± 0.04 cm (0.50 ± 0.015 in)
Leakage current (300 V collection potential) Less than 1013 A at 10 min polarization time, less than 1014 A at 2 hr polarization time
Intensity limits Continuous beam: 4.86 kR/min (1% recombination loss)
Pulsed beam 51.5 mR/pulse (1% recombination loss)

Typical energy dependence for 3.2 cc ion chamber
(phantom adapter removed)


3.2 cc High Sensitivity Ion Chamber Graph
Maximum pulse repetition rate 3.3 kHz
Cable length 3 ft (0.9 m)
Operating Voltage 300 V


Available model(s)
660-6 CT Ion Chamber, 3.2 cm3, with UHF termination: used with Victoreen® Model 660 Electrometer
500-100 CT Ion Chamber, 3.2 cm3, with coax BNC for signal & banana plug for bias: used with Model 35040 (ATD), TRIAD™ and TRIAD TnT
500-200 CT Ion Chamber High Sensitivity, 10 cm3 for multislice CT, with coax BNC for signal & banana plug for bias: used with Model 35040 ATD and other electrometer/dosimeters, including TRIAD and TRIAD TnT
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