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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
Model 1 - Miniature Shonka Thimble Chamber,
Exradin A1 Ion Chamber, SeeDOS Code Number 92705
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.
Model A1SL - Slim Line Miniature Shonka Thimble Chamber,
SeeDOS Code Number 92722
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
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.
Model 2 - Spokas Thimble Chamber, SeeDOS Code Numbers
( A2,P2,T2 ) : 92718,92720,92721
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
Models A3, A4, A5, A6
and A8 - Shonka-Wyckoff Chambers, SeeDOS Code Numbers : 92717 ( A3 ), 92715 ( A4 ),
92724 ( A5 ), 92716 ( A6 ), 92737 ( A8 )
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
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