RTI T20 Dose Probe

Almost not there
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 is protected from picking up backscatter.

Anywhere in the X-ray field
The RTI T20 can be placed anywhere in the X-ray field apart from many other detectors. For instance – the RTI Dose Probe – 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 which 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. RTI T20 gives about five times higher sensitivity than a typical ion chamber.

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

Art No: 9730015-00

T20 Dose Detector

General Specifications

  • Energy Dependence
    Less than 5 % RQR 50–150 kV
  • Connector
    Piranha type with automatic detector identification (ADI)
  • Size of detector house
    24 x 5 mm
  • Length
    318 mm (rod 280 mm + detector 26 mm + back mount 12 mm)

Specifications with Piranha

  • Ranges
    0.7 nGy – 10 kGy 0.08 µR – 1 MR. 27 nGy/s – 500 mGy/s. 3µR/s – 57 R/s
  • Inaccuracy
    ±5 % (RQR 50 – 150 kV)
  • Trig modes
    After Exposure, Continuous, Timed, and Free Run

Specifications with Cobia

  • Dose
    35 nGy – 15 kGy, 4 µR – 1700 kR
  • Dose Rate
    1.5 µGy/s – 1500 mGy/s, 10 mR/min – 10 kR/min
  • Dose per pulse
    5 nGy/pulse - 11 Gy/pulse, 0.6 µR/pulse - 1.3 kR/pulse
  • Inaccuracy
    ±5 %
  • Trig modes
    After Exposure, Continuous

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PTB is Germany's National Metrology Institute and handles scientific and technical service tasks. With metrology as the PTB's core competence, the organisation's goal is to measure with the highest accuracy and reliability. PTB represents progress and reliability in metrology for the benefit of society, trade and industry, and science.
The ANSI National Accreditation Board (ANAB) is the largest multi-disciplinary accreditation body in North America. ANAB accredits the full spectrum of conformity assessment bodies, including calibration, testing and inspection.
The International Electrotechnical Commission (IEC) is the world’s leading organization that prepares and publishes International Standards for all electrical, electronic and related technologies.
AAPM is a scientific and professional organization, composed of more than 8000 scientists, whose primary goal is the identification and implementation of improvements in patient safety for the medical use of radiation in imaging and radiation therapy.