We present a fast low-noise hybrid charge-sensitive preamplifier for germanium position-sensitive gamma-ray detectors. In conjunction with a bulky 36-fold segmented detector it provided an excellent resolution of 1.71/1.77 keV fwhm on the 1.17/1.33 MeV 60Co lines. The preamplifier rise time, as measured at the test bench, is as fast as 7.5 ns, with a detector capacitance of 21 pF and with a 5 m 50 ohm twisted-pair cable connected at its output. The dynamic range of the preamplifier input stage is as large as 92 dB, ranging from 0.275 fC to 9.9 pC, i.e., from 5 keV to 180 MeV in terms of photon energy. On signals larger than 2 MeV a fast reset (about 10 MeV/us) is enforced to reduce the system dead time. An estimate of the amplitude of such large signals is derived from the reset time, still obtaining a high resolution. Using this technique we achieved an energy resolution of 0.3% at 16.7 MeV.
An advanced preamplifier for highly segmented germanium detectors / A. Pullia, F. Zocca, G. Pascovici. - In: IEEE TRANSACTIONS ON NUCLEAR SCIENCE. - ISSN 0018-9499. - 53:5(2006 Oct), pp. 1710287.2869-1710287.2875.
|Titolo:||An advanced preamplifier for highly segmented germanium detectors|
PULLIA, ALBERTO (Primo)
ZOCCA, FRANCESCA (Secondo)
|Parole Chiave:||Charge-sensitive preamplifier ; gamma ray spectroscopy ; germanium detector|
|Settore Scientifico Disciplinare:||Settore ING-INF/01 - Elettronica|
|Data di pubblicazione:||ott-2006|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1109/TNS.2006.880402|
|Appare nelle tipologie:||01 - Articolo su periodico|
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