Detectors for Relative & Absolute Dosimetry

Detectors for Relative & Absolute Dosimetry



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Relative and Absolute Dosimetry ionization chambers and diodes for high energy photon and electron beams in Radiotherapy (Application energy range for photons from Co60 - 25 MV and for electrons from 4 MeV - 50 MeV. )


CC01 and CC04 Ionization Chambers

The ionization chamber CC01 and CC04 are intended for relative or absolute dose determination, depth dose measurements, and field profile analysis in a water phantom or in free air, for photon and electron beams.

The CC01 and CC04 are high spatial resolution, small volume chamber. It is waterproof, vented through a waterproof sleeve, and fully guarded.

  CC01 CC04
Active volume (cm3) 0.01 1
Inner radius (mm) 1 2

Sensitivity (Gy/C x 107)

317 94

 

 

 

 


CC13, CC13-S and CC25 Ionization Chambers

The ionization chambers intended for absolute and relative dosimetry of photon and electron beams in radiotherapy. Measurements can be performed in air, water phantoms, or solid phantoms. Can also be used as a standard chamber for clinical use in water phantoms.

High spatial resolution, small volume chamber. It is waterproof, vented through a waterproof sleeve, and fully guarded.

  CC13 CC13-S CC25
Active volume (cm3) 0.13 0.13 0.25
Inner radius (mm) 3 3 3
Sensitivity (Gy/C x 107) 27 27 13

 

 

 

 


FC23-C Ionization Chamber

The ionization chamber FC23-C is intended for dose measurements, depth dose measurements, and field profile analysis in a water phantom or in free air.

FC23-C is a waterproof, fully guarded, vented chamber, suitable for electron and photon beam dosimetry. The chamber is vented through a water-proof sleeve. FC23-C is PTB approved (15.101 / 97.02).

The FC23-C chamber is delivered with an individual factory calibration certificate.


FC65-G Ionization Chamber

The ionization chamber FC65-G is intended for absolute and relative dosimetry of photon and electron beams in radiotherapy. Measurements can be performed in air, water phantoms, or solid phantoms.

The FC65-G is an air ionization chamber, vented through a waterproof silicon sleeve. It is waterproof and fully guarded.

The FC65-G is PTB approved (15.101 / 97.04). The chamber is designed preferably for the energy ranges of photons and electrons at medical accelerators. It can also be employed in X-ray beams with generating potentials from 70 kV to 280 kV and for gamma radiation of 137Cs and 60Co. The energy range of proton beams with available chamber factors is between 50 and 250 MeV.

The FC65-G chamber is delivered with an individual factory calibration certificate


FC65-P Ionization Chamber

The Farmer type chamber FC65-P is an air ionization chamber, vented through a waterproof silicon sleeve. It is waterproof and fully guarded.

FC65-P is PTB approved (15.101 / 97.03).

The watertight chamber consists of a conducting plastic thimble and a pure aluminum inner electrode, supported by a thin aluminum stem. The stem terminates in a robust cable entry where the chamber is fixed on the appropriate chamber holder. A 1.40 m triaxial chamber cable surrounded by a watertight silicon sleeve is firmly connected to the cable entry, and allows air ventilation in accordance with the atmospheric pressure change.

The chamber is designed preferably for the energy ranges of photons and electrons at medical accelerators. It can also be employed in X-ray beams with generating potentials from 70 kV to 280 kV and for gamma radiation of
137Cs and 60Co. The energy range of proton beams with available chamber factors is between 50 and 250 MeV.

The FC65-P chamber is delivered with an individual factory calibration certificate.

As an associated measuring instrument for precise absolute dose determinations, in calibration dosimetry, compliance testing, or installation and set-up of treatment machines or other new equipment, it is recommended to use the reference-class therapy dosimeter Dose1 and Dose2.


Parallel Plate Chamber NACP

The NACP Parallel Plate Chamber is intended for absolute dosimetry measurements of electron beams with kinetic energy in the range 2-50 MeV. Measurements may be carried out in water, in air or in solid phantoms.

The NACP Chamber is designed according to the recommendations of the Nordic Association of Clinical Physicists (NACP).

The collecting electrode is manufactured of graphitized polystyrene.

Inner electrode diameter (mm) 10
Outer diameter (mm) 30
Guarding width (mm) 3
Sensitivity (Gy/C x 107) 16

 

 

 

 


PPC05 Ionization Chamber

The parallel plate ionization chamber PPC05 is designed for absolute and relative electron beam dosimetry above 2 MeV in the measuring quantity absorbed dose to water. It can be used for photon and proton absolute and relative dosimetry as well

PPC05 is an air-cavity ionization chamber with high spatial resolution.

The construction materials are air equivalent conducting plastic Shonka C552 (housing, entry window and side walls) and highly insulating plastics PEEK and PPE. The collecting electrode material is graphitized PEEK.

The chamber is constructed with a circular sensitive volume of planar geometry covered by a rigid 1 mm thick entry window. The small collecting volume with 0.6 mm plate spacing, 9.9 mm diameter and a 3.4-mm-wide guard ring enables excellent resolution in depth dose studies and requires a small perturbation correction. The chamber is waterproof and vented through a silicone sleeve

Inner electrode diameter (mm) 10
Outer diameter (mm) 30
Guarding width (mm) 1
Sensitivity (Gy/C x 107) 58

 

 

 

 


PPC40 Ionization Chamber

 The Parallel Plate Chamber PPC40 is designed for absolute and relative electron beam dosimetry above 2 MeV, in the measuring quantities absorbed dose to water and absorbed dose to air. It can also be used for photon (and proton) dosimetry in the measuring quantities mentioned above.

The chamber is entirely made from PMMA; electrode areas are additionally graphitized.

The waterproof chamber is vented through a silicone sleeve and it is constructed with a circular sensitive volume of planar geometry covered by a rigid 1 mm thick front window. The combination of design and material minimizes perturbation components, the in-scattering and the backscatter effect, to a perturbation correction factor equal to unity.

As an associated measuring instrument for precise absolute dose determinations, in calibration dosimetry, compliance testing or installation and set-up of treatment machines or other new equipment, it is recommended to use the reference-class therapy dosimeter Dose1 and Dose2.

Inner electrode diameter (mm) 16
Outer diameter (mm) 44
Guarding width (mm) 4
Sensitivity (Gy/C x 107) 9