For low dose rate measurements
The RTI Dose Probe is an external dose probe, designed to perform very low dose rate measurements for instance on image identifiers.

To avoid or minimize interference with AEC (Automatic Exposure Control) on X-ray equipment, the probe is very small. This also enables it to fit into the table bucky. Since it is a solid-state detector, no corrections for pressure or temperature are needed. Neither is polarizing voltage.


The RTI Dose Probe is small and has a fast response which makes it ideal for pulsed fluoroscopy. It can detect the individual pulses, determine pulse rate, and show waveforms at dose rate.

The RTI Dose Probe supports the ADI (automatic detector identification) system. When connected, the Piranha or Cobia automatically identifies the probe and makes all necessary adjustments without any need for interaction from the user. The RTI ADI system also gives full interchangeability of probes between different Piranha systems using the same type of probes.

With the extraordinary sensitivity of the Dose Probe, it is even suitable for scatter and leakage measurements.

Energy Dependence

Dose Probe diagram

Beam quality – W/3 mm A


Art. No: 9730003-00 

RTI Dose Probe

Specifications with Piranha

  • Type
  • Sensitivity
    55 µC/Gy
  • Size
    20 x 45 x 7.4 mm, 0.79" x 1.8" x 0.29". Weight 85 g (3 oz)
  • Active detector area
    10 x 10 mm, 0.39" x 0.39"
  • Cable length
    2.0 m (6.6 ft)
  • Connector
    Piranha type with automatic detector identification
  • Dose range
    0.1 nGy - >1.5 kGy. 0.012 µR - >170 kR
  • Dose rate range
    1 nGy/s - 150 mGy/s. 0.4 mR/h - 31 kR/h
  • Dose per pulse
    1 nGy/pulse - 0.3 Gy/pulse. 120 nR/pulse - 34 R/pulse
  • Backscatter protected

Specifications with Cobia Flex / Sense

  • Type
  • Inaccuracy
    ± 5%
  • Size
    20 x 45 x 7.4 mm, 0.79" x 1.8" x 0.29"
  • Weight
    85 g (3 oz)
  • Cable length
    2.0 m (6.6 ft)
  • Pulse frequency
    1/6 - 260 Hz
  • Dose
    5 nGy - 2 kGy. 0.6 µR - 250 kR
  • Dose rate
    0.2 µGy/s - 200 mGy/s. 1.5 mR/min - 1.5 kR/min
  • Dose per pulse
    1 nGy/pulse - 1600 mGy/pulse. 0.1 µR/pulse - 180 R/pulse
  • Backscatter protected

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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.