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Radiation Protection Dosimetry 2005 116(1-4):180-184; doi:10.1093/rpd/nci102
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Performance of a neutron spectrometer based on a PIN diode

S. Agosteo1,2,*, G. D'Angelo1,2, A. Fazzi1,2, A. Foglio Para1, A. Pola1,2, L. Ventura3 and P. Zotto3

1 Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy
2 INFN, Sezione di Milano, via Celoria 16, 20133 Milano, Italy
3 Dipartimento di Fisica, Università di Padova and INFN Sezione di Padova, via Marzolo 8, 35131 Padova, Italy

* Corresponding author: stefano.agosteo{at}polimi.it

The neutron spectrometer discussed in this work consists of a PIN diode coupled with a polyethylene converter. Neutrons are detected through the energy deposited by recoil-protons in silicon. The maximum detectable energy is ~6 MeV and is imposed by the thickness of the fully depleted layer (300 µm for the present device). The minimum detectable energy which can be assessed with pulse-shape discrimination (PSD) is ~0.9 MeV. PSD is performed with a crossover method and setting the diode in the ‘reverse-injection’ configuration (i.e. with the N+ layer adjacent to the converter). This configuration provides longer collection times for the electron–hole pairs generated by the recoil-protons. The limited interval of detectable energies restricts the application of this spectrometer to low-energy neutron fields, such as the ones which can be produced at facilities hosting low-energy ion accelerators. The capacity to reproduce continuous neutron spectra was investigated by optimising the electronic chain for pulse-shape discrimination. In particular, the spectrometer was irradiated with neutrons that were generated by striking a thick beryllium target with protons of several energies and the measured spectra were compared with data taken from the literature.


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 Radiat Prot DosimetryHome page
S. Agosteo, G. D'Angelo, A. Fazzi, A. F. Para, A. Pola, and P. Zotto
Neutron spectrometry with a monolithic silicon telescope
Radiat Prot Dosimetry, August 1, 2007; 126(1-4): 210 - 217.
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