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Tesi etd-04072017-120740


Thesis type
Tesi di laurea magistrale
Author
CHIAVACCI, GERARDO
email address
gerry90@hotmail.it, gerardo.chiavacci@gmail.com
URN
etd-04072017-120740
Title
Characterization of a new digital acquisition system for microdosimetry using a tissue equivalent proportional counter (TEPC)
Struttura
INGEGNERIA CIVILE E INDUSTRIALE
Corso di studi
INGEGNERIA NUCLEARE
Commissione
relatore Prof. Ciolini, Riccardo
Parole chiave
  • TEPC
  • Tissue Equivalent Proportional Counter
  • Microdosimetry
  • Digital Acquisition System
Data inizio appello
26/04/2017;
Consultabilità
completa
Riassunto analitico
Microdosimetry studies the probability distribution of the imparted energy when an ionizing particle crosses site size in order of the μm. <br>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). <br>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.<br>The aims of this work are:<br>• To perform a systematic investigation with a new digital acquisition system: by testing the resolution, input counting rate, dynamic range, stability and reproducibility.<br>• To optimize the electronic chain.<br>• To perform microdosimetric measurements with a TEPC with gamma and neutron sources.<br>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.
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