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 Exradin Ion Chambers 3
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Exradin Ion Chambers 3

Farmer Type, Micro and Low Energy Parallel Plate Chambers

SeeDOS provides the world-famous Exradin ion chambers. For over 25 years, Exradin chambers have provided uncompromising quality, scientific integrity and dependability. Exradin ion chambers are waterproof, fully guarded, and the chamber electrodes are made entirely of homogenous conducting plastic, providing excellent conductivity. For more information on Exradin products click here.

Exradin ionization chambers are available from SeeDOS for a wide range of dosimetric measurements in diverse radiation beams. The chambers find applications in the fields of radiation therapy, diagnostic radiology, and radiation protection and research. Applications for which Exradin chambers are suited include beam calibration, quality assurance, dose assessment, depth-dose studies, mixed field dosimetry, monitoring, background measurements, and a variety of research studies.

For an Electrometer for use with your Exradin Ion Chamber please click here

For a pictorial listing of available Cable Connectors, please click here

Exradin A12 Ion Chamber

 

Model A12 - Farmer-Type Chamber 0.6 cc, SeeDOS Code Number 927

UNCOMPROMISING QUALITY

For absolute dosimetry calibrations in water, air, or other phantom material

DESIGNED FOR ABSOLUTE DOSIMETRY CALIBRATION

Exradin Farmer-type Chambers are specifically designed for absolute dosimetry calibrations in water, air, or other phantom material. The Model A12 is completely characterized in TG 51 and TRS 398.

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

Farmer-type Chambers are constructed of rugged C552 Shonka air-equivalent plastic, providing excellent conductivity and years of reliable use. Rigorous one meter drop test proves ruggedness and reliability.

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
  • Shell, 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
  • 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
  • A matching 2.8 mm thick 60Co build-up cap of C552 Shonka air-equivalent plastic is provided for air calibrations and measurements
  • Additional build-up caps of Delrin and brass are available
  • Ionization collection efficiency is 99.9% or better
  • Collecting volume is 0.64 cc

Farmer Chamber geometry

  • Axially symmetric design

  • Homogeneous construction

  • Complete guarding

  • Waterproof construction

  • Integral flexible low-noise cable

  • Separable minimum scatter stem

  • Matching Cobalt-60 Cap included

  • Handsome wooden case

Collecting Volume: 0.65 cm3

Nominal Calibration Factor: 5.0 R/nC

Centroid of Collecting Volume: 12.9 mm from tip of chamber

Collector Diameter: 1.0 mm

Outside Diameter Sensitive Region: 7.1 mm

Wall Thickness: 0.5 mm

Wall, Collector, and Guard Material: Shonka air-equivalent plastic C552

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (shell of chamber is common with connector body).

Venting: Vented to the ambient via the flexible vent tube surrounding the triaxial cable.

Stem: 1/2" OD black phenolic two-piece (4" + 5") long

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

Exradin A12S Ion Chamber

 

Model 12S - Farmer-Type Chamber, 0.25 cc, SeeDOS Code Number ( A12S ) : 92725

UNCOMPROMISING QUALITY

For absolute dosimetry calibrations in water, air, or other phantom material

DESIGNED FOR ABSOLUTE DOSIMETRY CALIBRATION

Exradin Farmer-type Chambers are specifically designed for absolute dosimetry calibrations in water, air, or other phantom material. The Model A12S thimble chamber is a modified Farmer-Type Chamber Model A12. The collector length of the Model A12S is approximately one-third the size of the Model A12, which confines its collecting volume to more of the tip of the chamber.

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

Farmer-type Chambers are constructed of rugged C552 Shonka air-equivalent plastic, providing excellent conductivity and years of reliable use.

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
  • Shell, 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
  • 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
  • A matching 2.8 mm thick 60Co build-up cap of C552 Shonka air-equivalent plastic is provided for air calibrations and measurements
  • Additional build-up caps of Delrin and brass are available
  • Ionization collection efficiency is 99.9% or better
  • Collecting volume is 0.24 cc
  • Farmer Chamber geometry

  • Axially symmetric design

  • Homogeneous construction

  • Complete guarding

  • Waterproof construction

  • Integral flexible low-noise cable

  • Separable minimum scatter stem

  • Matching Cobalt-60 Cap included

  • Handsome wooden case

Collecting Volume: 0.25 cm3

Nominal Calibration Factor: 14.0 R/nC

Centroid of Collecting Volume: 5.8 mm from tip of chamber

Collector Diameter: 1.0 mm

Outside Diameter Sensitive Region: 7.1 mm

Wall Thickness: 0.5 mm

Wall, Collector, and Guard Material: Model A12S Shonka air-equivalent plastic C552

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (shell of chamber is common with connector body).

Venting: Vented to the ambient via the flexible vent tube surrounding the triaxial cable.

Stem: 1/2" OD black phenolic two-piece (4" + 5") long

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

Exradin A14 Ion Chamber

Model 14 - Exradin Microchamber, SeeDOS Code Numbers (A14) 92711, (T14) 92712

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

Features and Benefits

  • 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

 

  • Axially symmetric design

  • Extremely small gas volume

  • Homogeneous construction

  • Complete guarding

  • Waterproof construction

  • Integral flexible low-noise cable

  • Separable minimum scatter stem

  • Matching equilibrium caps available

Collecting Volume: 0.009 cm3

Nominal Calibration Factor: 365 R/nC

Centroid of Collecting Volume: Approx. 2.0 mm from tip of chamber

Collector: 1.5 mm diameter x zero length

Wall Thickness: 1.0 mm

Outside Diameter Sensitive Region: 6.0 mm

Wall, Collector, and Guard Material:

Model A14 Shonka air-equivalent plastic C552
Model T14 Shonka tissue-equivalent plastic A150

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (shell of chamber is common with connector body).

Venting: Vented to the ambient via the flexible vent tube surrounding the triaxial cable.

Stem: 1/2" OD black phenolic two-piece (4" + 5") long

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

 

Exradin A14SL Ion Chamber

 

Model 14SL - Slim Line Exradin Microchamber, SeeDOS Code Number 92723

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 A14SL Microchamber is designed specifically for assessing radiation fields encountered in IMRT and stereotactic radiosurgery. The Model A14SL thimble chamber is the Slim-Line version of Model A14. It has the exact same internal dimensions and collecting volume as the Model A14, yet the entire chamber has the uniform diameter of 6.4 mm (0.250 in), which is ideal when fitting it into a small phantom. 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

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 A14SL is constructed of rugged C552 Shonka air-equivalent plastic, providing excellent conductivity and years of reliable use.

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
  • Shell is are 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
  • Non-removable one piece stem for easy, precise positioning
  • Cobalt-60 build-up cap of C552 is 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

Axially symmetric design

  • Small gas volume

  • Homogeneous construction

  • Waterproof design

  • Complete guarding

  • Integral flexible low-noise cable

  • Matching equilibrium caps available

  • Handsome wooden case

Collecting Volume: 0.009 cm3

Nominal Calibration Factor: 365 R/nC

Centroid of Collecting Volume: Approx. 2 mm from outside tip of chamber

Collector: 1.5 mm diameter x zero length

Air Gap (along axis from inside tip of shell to collector): 2.2 mm

Outside Diameter Sensitive Region: 6.25 mm

Wall Thickness: 1.1 mm

Wall, Collector, and Guard Material: Model A14SL Shonka air-equivalent plastic C552

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (shell of chamber is common with connector body).

Venting: Vented to the ambient via the flexible vent tube surrounding the triaxial cable.

Stem: Integral with chamber, Aluminum, 0.246 in OD by 4 in long. Other lengths available upon request.

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

Exradin A14P Ion Chamber

 

Model 14P - Exradin Parallel Plate Microchamber, SeeDOS Code Numbers (A14P) 92713, (T14P) 92714

UNCOMPROMISING QUALITY

For superficial skin therapy measurements

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

  • C552 Shonka air-equivalent plastic Model A14P, REF 92713
  • A150 Shonka tissue-equivalent plastic, Model T14P, REF 92714

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines

  • Shell, 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

  • 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

  • Ionization collection efficiency is 99.9% or better

  • Only for use in one polarity

  • Collecting volume is 0.003 cc

  • Parallel-plate geometry

  • Axially symmetric design

  • Extremely small gas volume

  • Homogeneous construction

  • Complete guarding

  • Waterproof construction

  • Integral flexible low-noise cable

  • Separable minimum scatter stem

  • Matching equilibrium caps available

Collecting Volume: 0.002 cm3

Nominal Calibration Factor: 1430 R/nC

Centroid of Collecting Volume: 1.5 mm from tip of shell

Collector: 1.5 mm diameter x zero length

Window Thickness: 1.0 mm

Window-Collector Gap: 1.0 mm

Outside Diameter Sensitive Region: 6.0 mm

Window, Collector, and Guard Material:

Model A14P Shonka air-equivalent plastic C552
Model T14P Shonka tissue-equivalent plastic A150

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (shell of chamber is common with connector body).

Venting: Vented to the ambient via the flexible vent tube surrounding the triaxial cable.

Stem: 1/2" OD black phenolic two-piece (4" + 5") long

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

 

Model 15 - Low Energy Parallel Plate Diagnostic, SeeDOS Code Number (A15) :

  • Chamber

  • Planar geometry

  • Homogeneous construction

  • Complete guarding

  • Thin stretched conductive window

  • Enlarged collecting volume

  • Integral flexible low-noise cable

  • Handsome wooden case

Collecting Volume: 2.46 cm3

Nominal Calibration factor: 1.4 R/nC ; 12 Gy/m C, 0.15-5.00 mm Al HVL

Collector Diameter: 20.0 mm

Window-Collector Gap: 8.0 mm

Window: Conductive Kapton film, 3.86 mg/cm2

Body, Collector, and Guard Material: Model A15 Shonka air-equivalent plastic C552

Maximum Polarizing Potential: No greater than 1000 V

Inherent Leakage Currents: Less than 10-15 Amperes

Cable: 50 Ohms, 29 pF/f, 1.5 m long

Signal Connector: Triaxial BNC Plug

High Voltage Connector: Integral with triaxial connectors (window of chamber is common with connector body).

Venting: Two holes, diametrically opposite in window ring.

Stem: Black phenolic, 1/2" OD by 9" long.

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

Model A16 - Micropoint Chamber, SeeDOS Code Number 92726

  • Axially symmetric design  

  • Small gas volume

  • Homogeneous construction

  • Waterproof design

  • Complete guarding

  • Integral flexible low-noise cable

  • Uniform isotropic response on cylindrical axis measuring volume

  • Two separate stem pieces of 10.1 cm and 12.7cm can be coupled together for easy mounting

  • The chamber vents through a flexible tube that surrounds the triaxial cable. This vent tube is sealed to the chamber body and open near the connector

  • Extremely small field size of 4 x 4 mm allows for accurate measurements without partial volume effects.

 

Collecting Volume: 0.007 cm3

Nominal Calibration Factor: 400 R/nC (TG21)

Nominal Calibration Factor: 3.5 Gy/nC (Air Kerma)

Centroid of Collecting Volume: Approx. 1.7 mm from tip of shell

Collector: 0.3mm diameter x 1.3mm length

Outside Diameter of shell collecting volume: 3.4mm

Shell Wall Thickness: 0.5 mm

Shell, Collector, and Guard Material: Model A16 Shonka air-equivalent plastic C552

Stem: 6.4mm OD aluminium one-piece 10.1cm long; not removable

Waterproof: Yes, as furnished; no sheath required

Venting: Through Tygon PVC tubing secured to chamber body and running the full length of the triaxial cable; cable is inside tubing.

Build up Caps included with Chamber: Co-60 made of C552; wall thickness of 2.5mm

Options: None available

 

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

 

Model A18 - Scanning Ion Chamber, 0.125cc, SeeDOS Code Number 92729

Specifications

REF Number 92729
Collecting Volume 0.125 cm3
Nominal Calibration Factor 25 R/nC
Centroid of Collecting Volume 4.9 mm from tip of chamber
Collector Diameter 1.0 mm
Outside Diameter Sensitive Region 6.9 mm
Wall Thickness 1.0 mm
Shell, Collector, and Guard Material Shonka air-equivalent plastic C552
Included 60Co Buildup Cap Wall thickness of 2.0 mm; contructed of C552
Venting Vented to the ambient via the flexible vent tube surrounding the triaxial cable
Stem Non-removable 0.69 cm OD x 5.5 cm long, black anodized aluminum
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 A18 Schematic

For an Electrometer for use with your Exradin Chamber please click here

 

For a pictorial listing of available Cable Connectors, please click here

 

If you are interested in any of the products mentioned here, please fill out an Enquiry Form or Go To the Ion Chamber Product List / Quotation Request Form, so that we may promptly respond to your request.

 

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Please contact Colin Walters at cwalters@seedos.com if you would like further  information or you have questions

or comments about this web site.
SeeDOS Ltd, 26, The Maltings, Leighton Buzzard, Bedfordshire LU7 4BS, United Kingdom
Tel: +44 1525 850 670  Fax: +44 1525 850 685