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RTI - Model T20 - Radiographic Fluoroscopy Dose Probe
The RTI T20 Dose Probe is a solid-state detector dedicated to measurements on Rad/Fluoro systems when it is crucial that the detector itself does not have any effect on the system output or disturb 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.
The RTI T20 Dose Probe 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 dose detector gives about five times higher sensitivity than a typical ion chamber.
The RTI T20 Dose Probe fulfills the IEC directive for dose detectors regarding energy independence, measuring range, and angular dependency for RQR50–150 kV.
General Specifications
- Dimensions: Dimensions: 35 × 320 × 6.0 mm (metal 23,5 × 5,6 mm)
- Weight approx: 75 g (2.6 oz)
- Cable length: 2.0 m (6.6 ft)
- Temperate and air pressure: Insensitive, no TP correction is necessary
- Backscatter protection: Yes
- Angular dependence: Less than ±2 % for incident angles less than 10 degrees.
- Energy dependence: +1,6 to -0,4 % (radiation quality R1)
- Typical sensitivity: 8 μC/Gy
- Connector: Piranha external connector
Specifications with Piranha
- Dose: 0.7 nGy - 10 kGy (0.08 μR - 1 MR)
- Dose Rate: 27 nGy/s - 500 m Gy/s (3 μR/s - 57 R/s)
- Uncertainty: ±5 % (RQR, 50 - 150 kV)
- Time: 0.1 ms – 34000 s
- Pulses: 1 – 65535 pulses
- Pulse rate/frequency: 0.1 – 100 Hz
- Trig modes: Auto, Timed, and Free Run
Specifications with Cobia FLEX, Sense & Dental
- Dose: 40 nGy – 15 kGy (4.6 µR - 1700 kR)
- Dose Rate: 1.5 µGy/s – 1.5 Gy/s (170 µR/s – 170 R/s)
- Uncertainty: ±5 % (RQR, 50 - 150 kV)
- Time: 0.33 ms – 9999 s
- Pulses: 3 – 9999 pulses
- Pulse rate/frequency: 1/6 - 260 Hz
- Trig modes: Auto (Timed trig mode available with Ocean software)