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

The Model A10 Exradin Markus-type Chamber is a parallel plate, vented, waterproof, and fully guarded ion chamber ideally suited for calibrating electron beams. Its 4.3 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.

The small sensitive volume of the Model A10 makes it ideal for dose distribution measurements in a water phantom, providing excellent spatial resolution. An acrylic waterproof cap of 1.0 mm wall thickness is included with this chamber for use in TG 51 protocols. The circular collector of 5.4 mm diameter allows accurate measurements in small fields. The Model A10 is characterized for TG 51*.

ADAPTABLE DESIGN

The Model A10 Exradin Markus-type Chamber has the same external dimensions as the PTW Markus® chamber therefore solid phantoms machined to accept the Markus chamber accept the Model A10.

DURABLE CONSTRUCTION, BUILT TO LAST

The Model A10 is constructed of rugged C552 Shonka air-equivalent plastic, providing excellent conductivity and years of reliable use.

Features and Benefits

• Exceptionally wide guard ring yields stable, precise measurements and minimizes settling time by creating uniform field lines
• Chamber support rings, collector, and guard are made of C552 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 conductive Kapton film of 0.001 inch thickness (3.86 mg/cm²)
• Additional 2.8 mm Cobalt-60 build up cap of C552 conductive plastic is available
• 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
• Collecting volume is 0.050 cc

*Ref: Calculations for Plane-Parallel Ion Chambers in 60Co Beams Using the EGSnrc Monte Carlo Code, Med. Phys. 30 (2), February 2003

Markus® is a registered trademark of PTW-Freiburg and New York

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

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

The Model 11TW Exradin Spokas Thin-window Parallel Plate Chamber is a vented, waterproof, and fully guarded ion chamber ideally suited for superficial therapy beam and low energy diagnostic beam measurements such as those encountered in mammography. The thin-window imparts a nearly constant response over the entire energy range found in mammography. 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 11TW is inherently waterproof and may be operated while fully submerged without any kind of protective sheath. An acrylic waterproof cap of 1.0 mm wall thickness is included with this chamber for use in TG 51 protocols.

DURABLE CONSTRUCTION, BUILT TO LAST

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

• C552 air-equivalent plastic, Model A11TW, REF 92708
• D400 polystyrene-equivalent plastic, Model P11TW, REF 92709
• A150 tissue-equivalent plastic, Model T11TW, REF 92710

Features and Benefits

• Exceptionally wide guard ring yields stable, precise measurements and minimizes settling time by creating uniform field lines
• Chamber support rings, 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 conductive Kapton film of 0.001 inch thickness (3.86 mg/cm²)
• 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 0.92 cc