Dosimetry Equipment
Advanced Markus® Electron Chamber, Type 34045
Features
Perturbation-free version of the famous classic Markus chamber for absolute dosimetry in high-energy electron beams.
Features
- Well-guarded in accordance with TRS-398
- Thin entrance window and waterproof protection cap
- Small-sized for high spatial resolution
- Sensitive volume 0.02 cm3, vented to air
- Radioactive check device (option)
The 34045 Advanced Markus chamber is the successor of the well-known classic Markus electron chamber, equipped with a wide guard ring for perturbation-free measurements. The thin entrance window allows measurements in solid state phantoms up to the surface. The protection cap makes the chamber waterproof for measurements in water phantoms
Roos® Electron Chamber, Type 34001
Features
Waterproof plane parallel chamber for absolute dosimetry in high-energy electron and proton beams
Features
- Perturbation-free, minimized polarity effect
- Waterproof, wide guard ring design
- Sensitive volume 0.35 cm3, vented to air
- Radioactive check device (option)
The 34001 Roos chamber is the golden standard for absolute dose measurements in high-energy electron beams. Modern dosimetry protocols refer to the chamber’s design and provide dosimetric correction factors. Its waterproof design allows the chamber to be used in water or in solid state phantoms. The Roos chamber is also well suited for the measurement of high-energy photon depth dose curves. The chamber can be used for dose measurements of proton beams.
Farmer® Ionization Chamber waterproof, Type 30013
Features
Waterproof therapy chamber for reference dosimetry in high-energy photon, electron and proton beams
Features
- Acrylic wall, graphited
- Aluminum central electrode
- Sensitive volume 0.6 cm3, vented
- Reference class in accordance with IEC 60731 and AAPM TG-51 Addendum
The 30013 Farmer chamber is the standard ionization chamber for reference dose measurements in radiation therapy.
Correction factors needed to determine absorbed dose to water or air kerma are published in the pertinent dosimetry protocols.
Its waterproof design allows the chamber to be used in water or solid state phantoms. The acrylic chamber wall ensures the ruggedness of the chamber.
Semiflex 3D Ion Chamber, Type 31021
Features
Features
- Vented, waterproof, fully guarded – the ideal chamber for relative and reference dosimetry measurements in water, air or solid state phantoms
- True 3D geometry – uniform response in any direction
- Unique design – fast, accurate scanning in in-plane and cross-plane directions without tank rotation or change of detector setup
- Easy horizontal or vertical mounting for high-resolution measurements in both radial and axial orientations
- Reference-class ionization chamber with exceptional dosimetric characteristics – suitable for reference dosimetry following standard dosimetry protocols, e.g., IAEA TRS-398, AAPM TG-51
- Small size (0.07 cm³), high spatial resolution – perfect for measurements in small and FFF fields down to a field size of 2.5 cm x 2.5 cm
- Radioactive check device optionally available
Suitable for photon and electron dosimetry in
- LINAC Acceptance Testing
- TPS Beam Data Commissioning
- Clinical Reference Dosimetry
- Point Dose Measurements
multiple applications
PinPoint 3D Ion Chamber, Type 31022
Features
Ultra small-sized therapy chamber with 3D characteristics for dosimetry in high-energy photon beams
Features
- Small-sized cylindrical ion chamber with vented sensitive volume of only 0.016 cm³
- Small polarity effect
- Minimal cable irradiation effect
- Minimized directional response
- Short ion collection time, low pre irradiation dose
- Suitable for field sizes from 2 cm x 2 cm to 40 cm x 40 cm
The PinPoint 3D chamber is ideal for dose measurements in small fields as encountered e.g. in IORT, IMRT and stereotactic beams but can also be used for measurements in large fields. Designed for radial beam orientation, the small-sized chamber shows excellent 3D characteristics. Relative dose distributions can be measured with high spatial resolution in any direction.
The waterproof, fully guarded chamber can be used in air, solid state phantoms and in water.
microSilicon, Type 60023
Features
Silicon Detector for Small Photon and all Electron Fields
Features
- THE silicon detector for small photon fields
- Unshielded diode, perfectly suited for electrons
- Excellent dose stability (@6MV only 0.1%/ kGy)
- Very small detector to detector variation
- Very low dose per pulse dependence
- Very small sensitivity variation with temperature
- Improved water equivalence
Small field output correction factors should be applied when performing small field measurements. The small magnitude of these factors increases with decreasing field size. Additionally, the detector to detector variation of the microSilicon is almost negligible, which provides a sound basis for reliable small field correction factors. The new detector shows only a small loss of response over accumulated dose. The new design results in a very small water equivalent window thickness. This has positive effects on the output factors, the small field correction factors and the location of the effective point of measurement, which is now closer to the detector surface. Additionally, the profiles scanned by the micoSilicon are very close to a theoretical true profile.
microDiamond, Type 60019
Features
Diamond Detector for dosimetry in high-energy photon, electron, proton and carbon ion beams, especially useful for small field dosimetry.
Features
- Nearly water equivalent for all beam energies
- Very small sensitive volume (0.004 mm³) – perfect choice for small field dosimetry
- Suitable for all field sizes up to 40 cm x 40 cm
- Precise, accurate measurements in photon, electron and proton fields
- Excellent radiation hardness, minimal energy, temperature and directional dependence
- No high voltage required. Suitable for all connecting systems (BNT, TNC, M)
As a synthetic diamond detector, which is reproducibly manufactured in a new innovative production process, it combines the advantages of natural diamond detectors and silicon diode detectors almost perfectly. Due to its special design and material properties, microDiamond shows almost no deviations in absorbed dose to water even in the smallest field sizes, making it a perfect choice for accurate small field dosimetry.
T-REF Chamber, Type 34091
Features
Reference detector for small fields
Features
- Very low total area density of 206 mg/cm2
- No measurable perturbation of the beam
- High and very stable signal
- No contact to linac head
- Fast and easy to mount
The T-REF chamber 34091 provides a solution to the problem where to put a reference detector in small
fields. The T-REF chamber is a large-area plane-parallel transmission reference chamber and proved to be easy to use. From the minimum distance to the water surface on, there are no measurable perturbations of the beam. The very good signal-to-noise-ratio makes it an excellent option for the use as a reference detector.
Soft X-Ray Chamber, Type 34013
Features
Thin window plane-parallel chamber for dose measurements in superficial radiation therapy
Feature
- Ultra thin entrance window
- For low-energy photons from 15 kV to 70 kV
- Extremely small size
- Sensitive volume 0.005 cm3, vented
The 34013 soft X-Ray chamber is used for reference dose measurements in low-energy photon beams as used in superficial radiation therapy.
The chamber’s small size enables the user to perform measurements with excellent spatial resolution.
Correction factors needed for the determination of absorbed dose to water are available.
The chamber is designed for the use in solid state phantoms.
