RTI T20 Dose Probe


The RTI T20 Dose Probe is a solid-state detector dedicated for measurements on Rad/Fluoro systems when it is crucial that the detector itself does not have any effect on the system output or disturbs the X-ray beam.

It was developed for measurements of the patient entrance dose (skin dose) and the maximum dose rate in the radiographic and fluoroscopic field. Despite its small size, the RTI T20 Dose Detector is protected from picking up backscatter.

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Anywhere in the X-ray field

The RTI T20 Dose Detector can be placed anywhere in the X-ray field in contrast to many other detectors. The RTI Dose Probe, for instance, is small but not small enough in all situations. It still has to be placed outside the active area to avoid affecting the feedback of the system.

Independent and sensitive
The RTI T20 can connect to either Piranha, Cobia FLEX, or Cobia SENSE, and has a built-in correction filter that allows the detector to self-compensate for different beam energies.

Therefore it has a flat energy response in the radiographic range with no need for correction factors. The RTI T20 Dose Detector gives about five times higher sensitivity than a typical ion chamber.

The T20 fulfills the IEC directive for dose detectors regarding energy independence, measuring range, and angular dependency for RQR50–150 kV.

Specifications with Piranha

  • Ranges
    0.7 nGy - 10 kGy
    0.08 μR - 1 MR
    27 nGy/s - 500 m Gy/s
    3 μR/s - 57 R/s
  • Inaccuracy
    ±5 % (RQR 50 - 150 kV)
  • Energy dependence
    Less than ±5 % for RQR 50 - 150 kV
  • Angular dependence
    Less than ±2 % for incident angles less than 10 degrees.
  • Typical sensitivity
    8 μC/Gy
  • Connector
    Piranha external connector
  • Size of detector house
    26 x 5 mm²
  • Length
    318 mm (rod 280 mm + detector 26 mm + back mount 12 mm)
  • Trig modes
    After exposure, Continous, Timed, and Free Run