The
IC-1000 is a three terminal spherical ionization chamber with an
active volume of 1 liter. 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.
Specifications Ionization
Chamber: 1000 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:
3.4 x 10E6 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 if ordered
with gas flow option Accessories:
Supplied with wooden storage box
Ordering Information IC-1000:
Ionization chamber with storage box
IC-1000-GF: Ionization chamber with gas flow provision and storage
box Consult
factory for other wall materials.
Ionization
Chamber: 1000 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