Exradin A14 Microchamber

Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
Shell is made of durable, long lasting Shonka conductive plastic
Axially symmetric design of the chamber provides an uniform, isotropic response
Inherent waterproof construction eliminates need for additional protective coverings
Two separate stem pieces of 5.1 cm and 12.7 cm can be coupled together for ease of use
Cobalt-60 build-up caps of C552 and A150 are available
Additional build-up caps of Delrin and brass are available
Ionization collection efficiency is 99.9% or better
Collecting volume is 0.016 cc

UNCOMPROMISING QUALITY

For assessing pinpoint radiation fields for IMRT, stereotactic, orthovoltage x-rays, stereotactic, and superficial skin therapy

EXRADIN MICROCHAMBERS ARE IDEAL FOR SMALL FIELD SIZE IMRT APPLICATIONS

The Model 14 Microchamber is designed specifically for assessing radiation fields encountered in IMRT and stereotactic radiosurgery. Outwardly, the Microchamber is identical to the Model 1 Exradin Miniature Shonka Thimble chamber; both use the same base and shell. However, the Microchamber is capable of measuring extremely small field sizes of 4 mm by 6 mm allowing for exceptional spatial resolution and exact pinpoint beam profile characterization.

FAST, PRECISE MEASUREMENTS

Its waterproof construction and two piece removable stem makes it ideal for use in water phantoms. The chamber vents through a flexible tube that surrounds the triaxial cable, ensuring the collecting volume is in pressure equilibrium with the surroundings. The design assures there are no stem or voltage soakage effects, providing precise and reliable measurements.

DURABLE CONSTRUCTION, BUILT TO LAST

The Model 14 Microchamber is offered in two versions of rugged, Shonka plastic, providing excellent conductivity and years of reliable use:

C552 Shonka air-equivalent plastic Model A14, REF 92711
A150 Shonka tissue-equivalent plastic, Model T14, REF 92712

Specifications

REF Number	92711 - Model A14 92712 - Model T14
Collecting Volume	0.016 cm³
Nominal Calibration Factor	365 R/nC
Centroid of Collecting Volume	Approximately 2.0 mm from tip of chamber
Collector Diameter	0.33 mm
Outside Diameter of Shell Collecting Volume	6.0 mm
Wall Thickness	1.0 mm
Shell, Collector, and Guard Material	A14 - Shonka air-equivalent plastic C552, wire, conductive plastic T14 - Shonka tissue-equivalent plastic A150
Venting	Vented to the ambient via the flexible vent tube surrounding the triaxial cable
Stem	1.3 cm OD black phenolic, two-piece with 5.1 and 12.7 cm segments
Nominal Collection Efficiency	1.000
Maximum Polarizing Potential	1000 V
Nominal Inherent Leakage Currents	10^-15 A
Low-Noise Triaxial Cable	50 ohms, 29 pF/ft, 1.5 m long
Signal Connector	Triaxial BNC plug (2-Lug, male pin); others available upon request
High Voltage Connector	Integral with triaxial connector (shell of chamber is common with connector body)
Waterproof	Yes
Product Standards	CE₀₄₁₃, Designed to meet IEC 60601-1, IEC 60731

Model 14 Schematic