EXCEPTIONALLY WIDE GUARD RING AND SENSITIVE VOLUME ENSURE PRECISE DEPTH-DOSE MEASUREMENTS

The Model 11 Exradin Spokas Parallel Plate Chamber is a vented, waterproof, and fully guarded ion chamber ideally suited for routine electron beam measurements and for depth-dose studies in electron, photon, proton, and neutron beams. Its 4.4 mm guard ring width exceeds the 3 mm recommendation in TG 39 ensuring precise depth-dose measurements with no perturbation in field lines even at low energies.

Its sensitive volume makes it ideal for dose distribution measurements in a water phantom, providing excellent spatial resolution. The Model 11 is inherently waterproof and may be operated while fully submerged without any kind of protective sheath. The Model P11 is characterized for TG 51 and TG 398.

DURABLE CONSTRUCTION, BUILT TO LAST

The Model 11 Exradin Parallel Plate Chamber is available in three versions of rugged, Shonka plastic, providing excellent conductivity and years of reliable use:

• C552 air-equivalent plastic, Model A11, REF 92701
• D400 polystyrene-equivalent plastic, Model P11, REF 92703
• A150 tissue-equivalent plastic, Model T11, REF 92704

Features and Benefits

• Exceptionally wide guard ring yields stable, precise measurements and minimizes settling time by creating uniform field lines
• Chamber window, collector, and guard are made of durable, long lasting Shonka conductive plastic; use of homogeneous material throughout the chamber minimizes perturbation of the beam due to the presence of the chamber and optimizes measurements
• Chamber window material is a 1.0 mm thickness of C552, D400 or A150 conductive plastic
• Its waterproof construction makes it ideal for use in water phantoms
• Chamber vents through a flexible tube that surrounds the low-noise, flexible triaxial 1.5 m cable, ensuring the collecting volume is in pressure equilibrium with the surroundings
• Non-removable, rigid, one piece stem allows for easy, accurate positioning
• Additional Cobalt-60 buildup caps of C552, D400 and A150 plastic are available
• Collecting volume is 0.62 cc