In 2012 the work has been focused mainly on two directions:
A) test on the sensor chosen in 2011 as the base solution for the final wireless prototype in all the operational conditions during Interventional Radiology procedures.
B) development of a wireless 0-Prototype to start studying the actual implementation of a wireless system, such as the choise of the transmission protocol, the bandwidth required, the power consumption, the DAQ and control system.
The tasks accomplished are:
A1) Characterization of the diffused radiation; all the most common Interventional Radiology procedures have been identified, among which the more severe in terms of dose-rate, and the diffused spectra from a PMMA slabs phantom have been measured. A remarkable snall variation, with a peak at 37-40 keV, has been found for all the procedures.
A2) Angular dependence of the relative detection efficiency has been measured to be @ 50% for +- 80° angle, better than the commercial UNFORS EDD-30 (0% @ +- 60°).
Good linearity of the sendor response over three orders of magnitude in dose-rate (up to 400 microGy/s).
A3) Irradiation at a certified beam (A4 and QR7), with a spectrum similar to the one of the diffused radiation. Good linearity of the sensors up to 450 microSv/s.
A4) Test with a wired sensor weared by a medical staff during an Interventional Radiology procedure.
B1) Desing and implementation of a wireless 0-Prototype, using a local data processing capability (CPLD + MicroController + Wireless module).
B2) Firmware and DAQ development for the 0-Prototype and electriucal and functional tests.