Semiflex 3D Ion Chamber 31021
Always perfectly oriented.
The 34001 Roos chamber is the golden standard for reference 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.
Key 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 multiple applications
- LINAC Acceptance Testing
- TPS Beam Data Commissioning
- Clinical Reference Dosimetry
- Point Dose Measurements
The New Reference Class
Semiflex 3D meets and exceeds the performance requirements of a reference-class ionization chamber as laid out in AAPM TG-51 and IEC 60731:
- Minimal polarity effect (< 0.4 % correction, < 0.5 % maximum variation)
- Extremely low volume effect (est. ≤ 0.05 % correction in FFF field)
- Excellent chamber settling (< 0.3 %)
- Very low post-irradiation leakage – far below IEC 60731 requirements
- Significantly reduced cable effects (< 200 fC / (Gy * cm))
- Minimal chamber-to-chamber variation – reliable kQ and kS values