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Radiation Protection Dosimetry 2004 110(1-4):509-516; doi:10.1093/rpd/nch237
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

A recoil-proton spectrometer based on a p-i-n diode implementing pulse-shape discrimination

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

A recoil-proton spectrometer was created by coupling a p-i-n diode with a polyethylene converter. The maximum detectable energy, imposed by the thickness of the totally depleted layer, is ~6 MeV. The minimum detectable energy is limited by the contribution of secondary electrons generated by photons in the detector assembly. This limit is ~1.5 MeV at full-depletion voltage and was decreased using pulse-shape discrimination. The diode was set up 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 pulse-shape discrimination was based on the zero-crossing time of bipolar signals from a (CR)2–(RC)2 filter. The detector was characterised using monoenergetic neutrons generated in the Van De Graaff CN accelerator at the INFN-Laboratori Nazionali di Legnaro. The energy limit for discrimination proved to be ~900 keV.


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