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Mosaic diamond detectors for fast neutrons and large ionizing radiation fields
Author(s) -
Girolami Marco,
Bellucci Alessandro,
Calvani Paolo,
Cazzaniga Carlo,
Rebai Marica,
Rigamonti Davide,
Tardocchi Marco,
Pillon Mario,
Trucchi Daniele M.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532191
Subject(s) - ionizing radiation , neutron , optics , beam (structure) , materials science , saturation (graph theory) , neutron radiation , diamond , radiation , detector , reproducibility , physics , irradiation , nuclear physics , chemistry , mathematics , chromatography , combinatorics , composite material
First neutron and X‐ray beam tests on a novel 12‐pixel single‐crystal diamond mosaic detector are presented and discussed. Preliminary characterization of single‐pixel electronic properties, performed with α particles, results in charge carrier mobilities >2000 cm 2 Vs −1 and saturation velocities of the order of 10 7 cm s −1 . Signal stability over time, measured with a 241 Am source (37 kBq activity), is longer than 5 h. Tests under an intense X‐ray beam (1 Gy h −1 dose‐rate) show a very good response uniformity (down to about 1% of relative standard deviation from mean value), suggesting a high level of pixel reproducibility at intermediate bias voltages (ranging from 20 to 100 V). Response uniformity reduces at voltages >200 V, due presumably to radiation‐assisted detrapping effects. Preliminary results of 12‐pixel simultaneous acquisitions of X‐ray beam profiles and pulse height spectra under a fast neutron beam (14 MeV) are also presented.