RAZOR-Detector

RAZOR-Detector



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RAZOR-Detector

High Performance Diode Detector for Small Field Dosimetry in Radiation Therapy

The RAZOR Diode Detector is designed for Relative Dosimetry of Photon and Electron Beams in Radiotherapy

  • Depth dose and profile measurements ”in air” (i.e. inside a solid phantom) and in a water phantom
  • Output factor measurements in small to medium sized photon beams
  • Verified performances in the range of photon beam qualities  60 Co-15 MV, and 6-15 MeV electron energies
  • Rigid and long-lasting semiconductor
  • Based on p-type silicon diode chip
Dosimetric Performance
Parameter Value Conditions Notes
Typ. Max.
Sensitivity 4.1 nC/Gy   60Co  
Dose linearity  <0.2% 0.5%   0.02– 40 Gy,  60Co Absolute deviation from endpoint fit
Dose per pulse dependence ±0.5% ±1% D p  = 0.1– 2.3 mGy Normalization at 0.4 mGy
|dS/dD|    1% / kGy 2% / kGy 60Co Very worst case:  
real time sensitivity measurement
during irradiation, no annealing
1% / kGy 4% / kGy 6 MV
2% / kGy 4% / kGy  15 MV
0.1% / kGy 2% / kGy 10 MeV electrons ~1month between irradiation
and measurement
PRF dependency   0.5% 12– 400 Hz
D p  = 0.1– 2.3 mGy
Absolute sensitivity change
Energy dependence 0.5% 1% 5 x 5 cm 2 , 6 MV,  
30 cm depth
Absolute deviation between PDDs
measured with the Razor and CC08
chambers
Lifetime ≥200 kGy   10 MeV electrons  
Temperature dependence 0.05% / °C   15– 40°C  
         
Cables & Connectors
Cable length 2 meter
Cable Low-noise coaxial
Connector Triaxial 1 , TNC or BNC (with 2 lugs)
         
Materials & Dimensions
Stem material Stainless steel
Enclosure material ABS plastic (acrylonitrile butadiene styrene) and epoxy
Position of measurement point Indicated by a cross-hair at the top of the detector
Effective measurement point 0.8 ± 0.2 mm from surface
chip size 0.95 x 0.95 x 0.4 mm
Active detector diameter 0.6 mm
Active detector thickness 0.02 mm
Head diameter 4.0 mm
Head length 15.0 mm
Stem diameter 4.0 mm
Total length 60.0 mm