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Radiation Protection Dosimetry Advance Access originally published online on December 6, 2006
Radiation Protection Dosimetry 2006 122(1-4):382-386; doi:10.1093/rpd/ncl468
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A solid state microdosimeter based on a monolithic silicon telescope

S. Agosteo1,2, P. Colautti3, A. Fazzi1,2, D. Moro3,4 and A. Pola1,2,*

1 Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy
2 Istituto Nazionale di Fisica Nucleare, Sezione di Milano, via Celoria 16, 20133 Milano, Italy
3 Laboratori Nazionali di Legnaro, Istituto Nazionale di Fisica Nucleare, viale dell'Università 2, I-35020 Legnaro, Italy
4 Dipartimento di fisica Università di Ferrara, via Saragat 1, I-44100 Ferrara, Italy

* Corresponding author: andrea.pola{at}polimi.it


  Abstract

A monolithic silicon telescope, consisting of a {Delta}E and an E stage-detector (~1.9 µm and 500 µm thick, respectively), was coupled to a polyethylene converter in order to investigate the feasibility of a solid state microdosimeter with respect to the field-funnelling effect. This work discusses the preliminary results of an analytical approach for the correction of a spectrum measured with this silicon-based microdosimeter for tissue-equivalence and geometrical effects. The device was irradiated with 2.7 MeV monoenergetic neutrons at the INFN-Laboratori Nazionali di Legnaro (Legnaro, Italy). The non tissue-equivalence of silicon was corrected by exploiting the signals generated in the E-stage. The correction for the sensitive volume geometry was optimised by taking into account the track length distribution of the recoil-protons generated in the converter. The derived dose distribution of the energy imparted per event was compared to the one measured with a cylindrical tissue-equivalent proportional counter (TEPC). The agreement is satisfactory.


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