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 Exradin Ion Chambers 1
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Exradin Ion Chambers 1

Shonka, Spokas and Shonka Wyckoff 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 Chamber please click here

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

Exradin A1 Ion Chamber

Model 1 - Miniature Shonka Thimble Chamber, Exradin A1 Ion Chamber, SeeDOS Code Number 92705

UNCOMPROMISING QUALITY

For relative dosimetry scanning and measuring points in water, air, or other phantom material

A PERFECT BALANCE BETWEEN FAST SCANNING AND POINT DOSE MEASUREMENTS

The Exradin Miniature Shonka Thimble Chamber provides a perfect balance between fast scanning and point dose measurements within 1 cm in water, air, or other phantom material. Model A1, REF 92705 is completely characterized in TG 51 and TRS 398.

FAST, PRECISE MEASUREMENTS

The chamber features exceptional spatial resolution for relative dosimetry scanning and is capable of measuring small field sizes of 6 mm by 8 mm for accurate point dose 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 1 Exradin Miniature Shonka Thimble Chamber is offered in two versions of rugged, Shonka plastic, providing excellent conductivity and years of reliable use:

  • C552 Shonka air-equivalent plastic, Model A1, REF 92705
  • A150 Shonka tissue-equivalent plastic, Model T1, REF 92706

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
  • Shell, collector, and guard are all 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
  • Additional build-up caps of C552, A150, Delrin, and brass are available
  • Ionization collection efficiency is always 99.9% or better
  • Small collection volume allows for optimal spatial resolution and exact characterization of a small area of the beam in depth-dose measurements
  • Collecting volume is 0.053 cc

Axially symmetric design

  • Small gas volume
  • Homogeneous construction
  • Complete guarding
  • Waterproof construction
  • Integral flexible low-noise cable
  • Separable minimum scatter stem
  • Matching equilibrium caps available
  • Handsome wooden case

Collecting Volume: 0.056 cm3

Nominal Calibration Factor: 60 R/nC

Centroid of Collecting Volume: 4.0 mm from tip of chamber

Collector Diameter: 1.0 mm

Outside Diameter Sensitive Region: 6.0 mm

Wall Thickness: 1.0 mm

Wall, Collector, and Guard Material:
Model A1 : Shonka air-equivalent plastic C552
Model M1 : Magnesium
Model T1 : 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")

 

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 A1SL Ion Chamber

 

Model A1SL - Slim Line Miniature Shonka Thimble Chamber, SeeDOS Code Number 92722

UNCOMPROMISING QUALITY

For relative dosimetry scanning and measuring points in water, air, or other phantom material

A PERFECT BALANCE BETWEEN FAST SCANNING AND POINT DOSE MEASUREMENTS

The Exradin Miniature Shonka Thimble Chamber provides a perfect balance between fast scanning and point dose measurements within 1 cm in water, air, or other phantom material. The Model A1SL Thimble Chamber is the Slim-Line version of Model A1. It has the exact same internal dimensions and collecting volume as the Model A1, yet the entire chamber has the uniform diameter of 6.4 mm (0.250"), which is ideal when using a small phantom.

FAST, PRECISE MEASUREMENTS

The chamber features exceptional spatial resolution for relative dosimetry scanning and is capable of measuring small field sizes of 6 mm by 8 mm for accurate point dose measurements. Its waterproof construction 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 A1SL 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, collector, and guard are all 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
  • Non-removable one piece stem for easy, precise positioning
  • Additional build-up caps of C552, Delrin, and brass are available
  • Ionization collection efficiency is always 99.9% or better
  • Small collection volume allows for optimal spatial resolution and exact characterization of a small area of the beam in depth-dose measurements
  • Collecting volume is 0.053 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: 0.056 cm3

Nominal Calibration Factor: 60 R/nC

Centroid of Collecting Volume: 4.1 mm from tip of chamber

Collector Diameter: 1.0 mm

Outside Diameter Sensitive Region: 6.25 mm

Wall Thickness: 1.1 mm

Wall, Collector, and Guard Material: Model A1SL 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 A2 Ion Chamber

Model 2 - Spokas Thimble Chamber, SeeDOS Code Numbers ( A2,P2,T2 ) : 92718,92720,92721

UNCOMPROMISING QUALITY

For relative dosimetry scanning and measuring points in water, air, or other phantom material

A PERFECT BALANCE BETWEEN FAST SCANNING AND POINT DOSE MEASUREMENTS

The Spokas Thimble Chamber permits the precise measurement of exposure and air kerma in photon beams and of absorbed dose in photon, electron, proton, neutron, and mixed photon-neutron beams.

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 2 Exradin Spokas Thimble Chamber is available in three versions of rugged, Shonka plastic, providing excellent conductivity and years of reliable use:

  • C552 air-equivalent plastic, Model A2, REF 92718, appropriate for exposure or air kerma
  • D400 polystyrene-equivalent plastic, Model P2, REF 92720, appropriate for use with a polystyrene phantom
  • A150 tissue-equivalent plastic, Model T2, REF 92721, appropriate for absorbed dose in either tissue or water

Features and Benefits

  • Proven guard design yields stable, precise measurements and minimizes settling time by creating uniform field lines
  • Shell, collector, and guard are all 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
  • Additional Cobalt-60 build-up caps of C552, D400, and A150 are available
  • Ionization collection efficiency is always 99.9% or better
  • Collecting volume is 0.53 cc
  • Axially symmetric design

  • High collection efficiency

  • Homogeneous construction

  • Complete guarding

  • Waterproof construction

  • Integral flexible low-noise cable

  • Separable minimum scatter stem

  • Matching equilibrium caps available

  • Handsome wooden case

Collecting Volume: 0.5 cm3

Nominal Calibration Factor: 6 R/nC

Centroid of Collecting Volume: 7.0 mm from tip of chamber

Collector Diameter: 4.6 mm

Outside Diameter Sensitive Region: 11.5 mm

Wall Thickness: 1.0 mm

Wall, Collector, and Guard Material:

Model A2 Shonka air-equivalent plastic C552
Model P2 Polystyrene Equivalent
Model T2 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 A3 Ion Chamber
Exradin A4 Ion Chamber
Exradin A5 Ion Chamber
Exradin A6 Ion Chamber
Exradin A8 Ion Chamber

Models A3, A4, A5, A6 and A8 - Shonka-Wyckoff Chambers, SeeDOS Code Numbers : 92717 ( A3 ), 92715 ( A4 ), 92724 ( A5 ), 92716 ( A6 ), 92737 ( A8 )

UNCOMPROMISING QUALITY

Ideal for calibration standards laboratories, health physics, research applications, manufacturing, and accelerator room scatter measurements

SHONKA-WYCKOFF SPHERICAL CHAMBERS ARE RELIED UPON BY STANDARDS LABORATORIES THROUGHOUT THE WORLD

Exradin Shonka-Wyckoff Spherical Chambers are designed for the precise measurement of radiation exposure and exposure rates. They are easily centered for precise positioning and are excellent for in-air measurements.

FAST, PRECISE MEASUREMENTS

The design assures there are no stem or voltage soakage effects, providing precise and reliable measurements.

DURABLE CONSTRUCTION, BUILT TO LAST

The Spherical 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
  • Non-removable one piece stem for easy, precise positioning
  • 60Co build-up cap of C552 is available : A6 has integrated Co-60 build up cap
  • Additional build-up caps of Delrin are available
  • Ionization collection efficiency is 99.8% or better
  •  A non-removable, triaxial BNC connector is mounted to the stem of the A6
  •  A8 has no stem instead mounting to include Acrylic support stand. A8 venting is located on the chamber neck
  • Collecting volume is 3.6 cc ( A3 ), 30cc ( A4 ), 100cc ( A5 ), 800cc ( A6 ) and 15.7 Litres ( A8 )
  • Sound design
  • Homogeneous construction
  • Complete guarding
  • Ruggedly built
  • Reliability of a standard
  • Matching equilibrium caps available
  • Rapid pressure equilibrium
  • Handsome wooden case


Specifications

Model

R

in

r

in

w

mm

D

in

Stem Diameter

in

Collecting Volume

cc

Calibration Factor

R/nC

A3
0.38
0.04
0.25
0.312
0.312
3.6
0.9
A4
0.75
0.08
0.50
0.375
0.375
30
0.09
A5
1.12
0.12
0.50
0.500
0.500
100
0.03
A6
2.25
0.24
1.00
0.875
0.500
800
0.004

A8 : 15.7 Litre volume

Features

Collecting Volume: See table

Collector Diameter: 2r (see table for values of r)

Wall Thickness: w (see table for values of w)

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, except connector is attached directly to stem in the A6

Signal Connector: Triaxial BNC Plugs

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

Vent Holes: Two holes, open to the ambient, are located on the neck of the chamber.

Stem: Black phenolic, 9 in long. See table for stem diameter. Special stem arrangements are available upon special 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.

 

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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