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The
IC-80 is a three terminal spherical ionization chamber. It has an
active volume of 80cc. This chamber is used for direct comparison
of radiation source strengths, beam monitoring in accelerator facilities,
and accurate measurement of absorbed dose at a prescribed experimental
point. The spherical detector is mounted on the end of a stem with
the signal connections made through a terminal block. The block
contains the BNC signal connector and the MHV high voltage connector.
The stem effects are less than 1 x 10E-12A for a 1 x 10E4 R/h exposure
with Co60. The effect may be minimized by using a + and – collecting
voltage on the detector and averaging the readings.
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Specifications
 Ionization
Chamber: 80 cc spherical collecting volume; guarded three-terminal
design; Tissue Equivalent plastic wall and collecting electrode;
mounted on a 10.5-inch (26.7 cm) long aluminum stem; built in gas
flow provision is optional
Wall Materials:
Tissue Equivalent plastic r =239 mg/cm3
Signal Connector:
BNC, mates with UG26OB/U or equivalent
Signal Output:
3.8 x 10E7 R/coul for air with CS137
Leakage:
Typically 5 x 10E-15 A when low noise coax is used (measured without
collection voltage).
Collection
Efficiency: 99% for 3x10E5 R/h @ 250V, 99% for 7x10E5 R/h @ 300V
Recommended
Signal Cable: Low noise coaxial, e.g., MALCO 250-3834-0000
High Voltage
Requirements: Positive or negative polarity, 250 to 500 V depending
on source strength. Shell is at high voltage potential.
High Voltage
Connector: MHV, mates with UG 932 A/U or equivalent; optionally
SHV
High Voltage
Cable: RG-59/U or equivalent
Overall Size
and Weight: Length including connectors, 14.0 inches (35.7 cm);
stem is 10.5 inches (26.7 cm) long; weight 94 grams
Calibration
Furnished: R/coul at Cs137 with air and appropriate gas
Accessories:
Supplied with wooden storage box
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Ordering Information
IC-80: Ionization Chamber with storage box
IC-80-GF:
Ionization Chamber with gas flow provision and storage box
IC-80G:
Ionization Chamber with graphite wall, gas flow provision, and
storage box
Consult
factory for other wall materials
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