ION CHAMBERS UNCOMPROMISING QUALITY Designed with over 30 years of scientific integrity for a broad range of dosimetry measurements in diverse radiation beams
Farmer-type Chambers For absolute dosimetry calibrations in water, air or other phantom material MODELS A12 and A12S Constructed of C552 Shonka air-equivalent conducting plastic, providing robust design and excellent conductivity with the shell, collector and guard made of the same material eliminates fragility or flaking of painted conductive layers found in many chambers Farmer-type chamber geometry with the advantage of uniform field characteristics for an isotropic response throughout the chamber Inherently waterproof construction for use in most water phantoms, eliminating the need for additional protective coatings Model A12 is completely characterized in TG-51 & TRS-398 Axially symmetric design, homogeneous construction and uniform spatial resolution ensures maximum collection efficiency Complete guarding results in little to no variation of response throughout the radiation field allowing for more precise measurements Two separate stem pieces of 5.1 cm and 12.7 cm can be coupled together for flexibility of operation and length Chamber vents through a flexible tube surrounding the triaxial cable vent tube is sealed to the chamber body and open near the connector Matching 2.8 mm thick Cobalt-60 buildup cap of C552 Shonka air-equivalent plastic with wooden storage case included Designed to have no variation of polarizing potential and no stem or voltage soakage effects mean the ionization current may be read immediately Model A12 Model A12S MODEL A12 MODEL A12S Rigorous one meter drop test proves ruggedness and reliability.
MicroChambers For assessing pinpoint radiation fi elds for IMRT orthovoltage, x-rays, stereotactic and superfi cial skin therapy MODELS 14, A14SL and A16 Axially symmetric design, homogeneous construction and complete guarding for uniform field lines Extremely small volumes allow for exceptional spatial resolution and exact pinpoint characterization of a small area of the beam and beam profile measurements Inherently waterproof construction Uniform isotropic response on cylindrical axis measuring volume Model 14 has two separate, removable stem pieces of 5.1 and 12.7 cm that can be coupled together for easy mounting Models A14SL and A16 have a one-piece, non-removable 5.6 cm stem Chamber vents through a flexible tube surrounding the triaxial cable vent tube is sealed to the chamber body and open near the connector Capable of measuring extremely small field sizes of 4 x 6 mm for Models 14 and A14SL, and 3.4 x 3.4 mm for Model A16 allowing for accurate measurements while minimizing partial volume effects Model 14 0.009cc Model A14SL 0.009cc MODELS 14 & A14SL Model A16 0.007cc Ref: The Behavior of Several Microionization Chambers in Small Intensity Modulated Radiotherapy Fields, Med. Phys. 31 (10), October 2004 Exradin MicroChambers are ideal for small field size IMRT applications.
Miniature Shonka Thimble Chambers For relative dosimetry scanning and measuring points in water, air or other phantom material MODELS 1, A1SL, 2 and A18 Axially symmetric design, homogeneous construction and complete guarding for uniform field lines Small volumes allow for excellent spatial resolution and exact characterization of a small area of the beam in depthdose measurements can also be used for high energy photon and electron beam calibration Inherently waterproof construction for use in most water phantoms eliminating the need for protective coverings Two separate stem pieces of 5.1 and 12.7 cm can be coupled together for easy mounting on Models 1 and 2 Intended for exposure, air kerma measurement and facilitating the determination of absorbed dose water, Model 2 is ideal for routine beam calibration Uniform response on cylindrical measuring volume Excellent saturation characteristics make Model 2 suitable for pulsed radiation Perfect balance between fast scanning speeds and accurate point dose measurements within 1 cm Shell, collector and guard made of extremely robust Shonka conductive plastic for years of durability Chamber vents through a flexible tube surrounding the triaxial cable vent tube is sealed to the chamber body and open near the connector Model 1 Model A1SL Model 2 Model A18 MODELS 1 & A1SL MODEL 2 MODEL A18 Exradin Thimble Chambers provide a perfect balance between fast scanning and point dose measurements.
Parallel Plate Chambers For use in routine electron beam measurements and for depth-dose studies in electron, photon, proton and neutron beams MODELS A10, 11, 11TW, MAGNA 1cc and MAGNA 3cc Models A10 and P11 are characterized for TG-51* and TRS-398 Fully guarded for extremely uniform field lines and negligible variation of polarizing potential no need for polarity corrections Exceptionally wide guard rings ensure precision in depth-dose measurement with no perturbation in field lines even at low energies exceeding a 3 mm width as recommended in TG-398 Durable construction with homogeneous conductive plastic means minimal scatter Rigid stem allows accurate positioning of chamber Chamber vents through a flexible tube surrounding the triaxial cable vent tube is sealed to the chamber body and open near the connector (Models A10 and 11) Model 11 inherently waterproof not requiring additional cap or covering Models A10 and 11TW require waterproof caps due to Kapton film windows Model 11 ideally suited with larger volume for routine electron field measurements in a water phantom Cobalt-60 buildup cap available Model A10 is ideally suited for smaller electron field measurements in a water phantom 1 mm waterproof acrylic buildup cap for TG-51 is included Model A10 capable of measuring at zero depth in buildup region of an electron field Model 11 Magna 1cc Model 11TW Magna 3cc Model A10 * Ref: AAPM s TG-51 Protocol for Clinical Reference Dosimetry of High-Energy Photon and Electron Beams, Med. Phys. 26 (9), September 1999 Ref: Calculations for Plane-Parallel Ion Chambers in 60 Co Beams Using the EGSnrc Monte Carlo Code, Med. Phys. 30 (2), February 2003 Exradin Parallel Plate Chambers are characterized for TG-51 and TG-398
CT Chambers For performing the measurements necessary for calculating the CTDI, as described in the new AAPM TG Report No. 74 *, Quality Control in Diagnostic Radiology MODELS A101 and A17 Model A101 is designed with acrylic sheath for use with phantoms that have a typical 13.1 mm cavity Fiducial markers identify center and both ends of the collecting volume providing easy setup in relation to the beam Excellent response uniformity with Model A101 over the central 10 cm of chamber length variation less than ± 3% Body tube and guard constructed of C552 Shonka air-equivalent conducting plastic, providing robust design and excellent conductivity eliminates fragility or flaking of painted conductive layers found in many chambers Model A17 provides an extremely flat response within ± 1.5% across its active length of 8 cm without polarity or perturbation effects Inherently waterproof, Model A17 is a unique CT ion chamber used for checking the consistency of the beam at various jaw widths Model A17 has an inherent Co-60 buildup cap built into its wall thickness Model A101 Model A17 * Ref: AAPM Report No. 74 Quality Control in Diagnostic Radiology, Medical Physics Publishing, 2002 Exradin CT Ion Chambers combine robust design with uniform energy response.
Shonka-Wyckoff Spherical Chambers For calibration laboratories, research applications, manufacturing and accelerator room scatter measurements MODELS A3, A4, A5, A6 Precise in air measurements from multiple fields without moving the chamber Obtain accurate measurements in any direction without absorption of the radiation by the body of the chamber Spherical volume chambers are easily centered for precise positioning resulting in accurate measurements Rugged design with integral rigid stem for easy, precise positioning Extended energy range through the use of equilibrium caps Constructed of C552 Shonka air-equivalent conducting plastic, providing robust design and excellent conductivity eliminates fragility or flaking of painted conductive layers found in many chambers Models A5 and A6 have a triaxial BNC connector mounted to the stem Model A3 Model A4 Model A5 Model A6 Shonka-Wyckoff Spherical Chambers are relied upon by standards laboratories throughout the world.
EXRADIN Ion Chambers Product Matrix FARMER-TYPE CHAMBERS MICROCHAMBERS MINIATURE SHONKA THIMBLE CHAMBERS MODEL A12 A12S 14 A14SL A16 1 A1SL 2 18 Collecting Volume 0.65 cc 0.25 cc 0.009 cc 0.009 cc 0.007 cc 0.056 cc 0.056 cc 0.53 cc 0.125 Centroid of Collecting Volume from exterior tip 12.9 mm 5.8 mm 2.0 mm 2.1 mm 1.8 mm 4.0 mm 4.1 mm 7.0 mm 4.9 m Centroid of Collecting Volume from exterior surface of window Outside Diameter of Shell Collecting Volume Inside Diameter of Shell Collecting Volume 7.1 mm 7.1 mm 6.0 mm 6.35 mm 3.4 mm 6.0 mm 6.35 mm 11.5 mm 6.9 m 6.1 mm 6.1 mm 4.0 mm 4.15 mm 2.5 mm 4.0 mm 4.15 mm 9.5 mm 7.9 m Window Collector Gap Shell Wall Thickness 0.5 mm 0.5 mm 1.0 mm 1.1 mm 0.5 mm 1.0 mm 1.1 mm 1.0 mm 1.0 m Collector Diameter 1.0 mm 1.0 mm 0.3 mm 0.3 mm 0.3 mm 1.0 mm 1.0 mm 4.6 mm 1.0 m Guard Ring Radial Widths Collector Length 21.6 mm 7.4 mm 1.52 mm 1.52 mm 1.27 mm 4.4 mm 4.4 mm 8.4 mm 6.4 m Window Material* Window Thickness Inner Axial Length of Collecting Volume 24 mm 10 mm 2.7 mm 2.7 mm 2.5 mm 5.8 mm 5.8 mm 10.9 mm 8.25 m Window or Support Rings, Collector and Guard Material* Shell, Collector and Guard Material* A A A, T A A A, T A A, P, T A Nominal Air Kerma Calibration Factor 44 Gy/µC 120 Gy/µC 3.2 Gy/nC 3.2 Gy/nC 3.5 Gy/nC 530 Gy/µC 530 Gy/µC 53 Gy/µC 230 G Nominal Leakage <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 Maximum Polarizing Voltage 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 v Waterproof Yes Yes Yes Yes Yes Yes Yes Yes Ye Included Buildup Cap Co-60 Co-60 None None Co-60 None None None Co-6 * MATERIAL: A C552 Shonka air-equivalent plastic P D400 polystyrene-equivalent plastic T A150 Shonka tissue-equivalent plastic Nominal calibration factor for energies greater than 200 kev
CT ION CHAMBERS SHONKA-WYCKOFF SPHERICAL ION CHAMBERS PARALLEL PLATE ION CHAMBERS 101 17 A3 A4 A5 A6 A10 11 11TW Magna 1 cc Magna 3 cc cc 4.6 cc 1.91 cc 3.6 cc 30 cc 100 cc 800 cc 0.05 cc 0.62 cc 0.94 cc 1.0 cc 3.0 cc m 1.0 mm 2.0 mm 1.5 mm 3.96 mm 3.96 mm m 10.0 mm 12.7 mm 20.0 mm 39.2 mm 62.8 mm 120.4 mm m 8.0 mm 6.1 mm 19.5 mm 38.2 mm 56.8 mm 114.4 mm 2.0 mm 2.0 mm 3.0 mm 7.92 mm 7.92 mm m 1.0 mm 3.3 mm 0.25 mm 0.5 mm 3.0 mm 3.0 mm m 2.4 mm 2.4 mm 2.0 mm 4.0 mm 6.0 mm 11.6 mm 5.4 mm 20.0 mm 20.0 mm 12.7 mm 21.9 mm 4.3 mm 4.4 mm 4.4 mm 3.9 mm 7.6 mm m 100 mm 80 mm 13.3 mm 24.9 mm 37.3 mm 74.0 mm 3.86 mg/cm 2 Kapton 1.0 mm, A, P, or T 3.86 mg/cm 2 Kapton 3.86 mg/cm 2 Kapton 3.86 mg/cm 2 Kapton 0.03 mm 1.0 mm 0.03 mm 0.03 mm 0.03 mm m 120 mm 110 mm A A, P, T A, P, T A A A A A A A A y/µc 5.2 Gy/µC 1.2 R/nC 0.9 R/nC 0.09 R/nC 0.03R/nC 0.004R/nC 530 Gy/µC 48 Gy/µC 30 Gy/µC 180 Gy/µC 2.1 R/µC amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-15 amps <10-14 amps <10-14 amps olts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 1000 volts 400 volts 400 volts s No Yes No No No No Yes, with included cap Yes Yes, with included cap No No 0 Acrylic sleeve Co-60 integral None None Co-60 integral Co-60 integral 1.0 mm acrylic, TG-51 Compliant None 1.0 mm acrylic, TG-51 Compliant None None
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