Based on the 3rd generation of pSi semiconductors. Since their introduction in 1992, the high doped p-type silicon detector chips, specifically designed for radiation therapy applications, have been the natural choice for measurements where high spatial resolution is required. The accuracy and lifetime of the diode detectors is unsurpassed in the field of radiation therapy today.
Description
PDD (Percentage Depth Dose) and TMR (Tissue Maximum Ratio) measurements in water are the most demanding relative measurements. Since both the dose rate and the energy spectra change with depth, the 3G-pSi detectors are designed to be independent of these parameters.
| Type | Application | Color |
PFD 3G-pSi | Photon beams, 1 to 20 MeV | Yellow |
Technical specs
PFD 3G-pSi photon diode field detector
- Stem material: Stainless steel
- Enclosure material: ABS and epoxy
- Position of measurement point: Indicated by a cross-hair at the top of the detector
- Effective measurement point (mm): 1.2 ± 0.2 from surface
- Chip size (mm): 2.1 ˣ 2.1 ˣ 0.4
- Active detector diameter (mm): 1.6
- Active detector thickness (mm): 0.08
Operational characteristics for PFD 3G-pSi
- Typical sensitivity: 100 nC/Gy
- Sensitivity decrease: Co-60 < 1%/250 Gy ; 6 MV < 1%/250 Gy ; 15 MV < 1%/250 Gy
- Dose rate linearity, conventional beams: < 1% in the range 0.1 - 0.6 mGy/pulse
- Dose rate linearity, FFF beams: 3% at 1.0 mGy/pulse, 7% at 2.3 mGy/pulse
- Sensitivity change with temperature: 0.25%/oC (typical)
- Operating Voltage: 0 V
- Waterproof: Yes
- Polarity: Positive current on center connection
Related Products
EFD 3G-pSi electron diode field detector
For electron relative field analysis and output factor measurements.
Discover
Stealth Chamber
Perturbation Free "Beam Invisible"
Reference Signal Chamber for Relative Dosimetry
RAZOR Nano Chamber
Smallest available Ionization Chamber for Small Field Dosimetry worldwide
Discover
myQA HALO Package
for Ethos™️ / Halcyon® ¹
The commissioning and beam data collection
package for the Varian Halcyon® / Ethos™ ¹ machine.
