|
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
Model
A12 - Farmer-Type Chamber 0.6 cc, SeeDOS Code Number 927
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.
Model 12S - Farmer-Type Chamber, 0.25 cc, SeeDOS Code Number
( A12S ) : 92725
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.
Model 14 - Exradin Microchamber, SeeDOS Code Numbers (A14) 92711, (T14) 92712
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.
Model 14SL - Slim Line Exradin Microchamber, SeeDOS Code Number 92723
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
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.
Model 14P - Exradin Parallel Plate Microchamber, SeeDOS Code Numbers (A14P) 92713, (T14P) 92714
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.
|
TOP OF PAGE
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
|
| 
