Microdosimetry studies the probability distribution of the imparted energy when an ionizing particle crosses site size in order of the μm. The Tissue Equivalent Proportional Counter (TEPC) is a microdosimetric instrument that measures radiation dose and dose equivalent in complex radiation fields (fields containing a mixture of particle types). The signal processing chain convert the signal from the TEPC in a pulse signal and measure the pulse height distributions which correspond to an energy deposition distribution in the simulated microscopic volume of the detector. The aims of this work are: • To perform a systematic investigation with a new digital acquisition system: by testing the resolution, input counting rate, dynamic range, stability and reproducibility. • To optimize the electronic chain. • To perform microdosimetric measurements with a TEPC with gamma and neutron sources. Lineal energy distributions for neutrons and gamma rays were measured using a TEPC with three different preamplifiers and with both acquisition systems, Inspector from Canberra and the DT5780 from CAEN. A series of measurements were performed with the counter filled with propane-based tissue equivalent gas at operating gas pressure corresponding to a site size of 2.0 μm in diameter.
|Qualification||Master of Science|
|Date of Award||26 Apr 2017|
|State||Published - 26 Apr 2017|