Response of AGATA segmented HPGe detectors to gamma-rays up to 15.1 MeV

Crespi, F. C. L.; Avigo, R.; Camera, F.; Blasi, N.; Bottoni, S.; Bracco, A.; Brambilla, S.; Casati, P.; Coniglio, F.; Corsi, A.; Giaz, A.; Leoni, S.; Million, B.; Nicolini, R.; Pellegri, L.; Riboldi, S.; Vandone, V.; Wieland, O.; Akkoyun, Serkan; Ataç, A.; Bazzacco, D.; Bellato, M.; Bortolato, D.; Calore, Enrico; Ciemała, M.; Farnea, E.; Gadea, A.; Gottardo, A.; Kmiecik, M.; Maj, A.; Mengoni, D.; Michelagnoli, C.; Montanari, D.; Napoli, D. R.; Nyberg, J.; Recchia, F.; Şahin, E.; Söderström, P.-A.; Ur, C. A.; Dobón, J. J. Valiente

doi:10.1109/nssmic.2011.6154591

Cited by 2 publications

(2 citation statements)

References 23 publications

(34 reference statements)

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“…1). It is supposed that the HPGe detectors have an energy resolution of 0.05% (in RMS), which is achievable with the present detector technology 46,47 . The Ge crystals have a 10 cm diameter and a 10 cm length.…”

Section: Methodsmentioning

confidence: 99%

Nuclear resonance fluorescence drug inspection

Lan

Song

Huang

et al. 2021

Sci Rep

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There is an increasing challenge to prevent illicit drug smuggling across borders and seaports. However, the existing techniques in-and-of-themselves are not sufficient to identify the illicit drugs rapidly and accurately. In the present study, combining nuclear resonance fluorescence (NRF) spectroscopy and the element (or isotope) ratio approach, we present a novel inspection method that can simultaneously reveal the elemental (or isotopic) composition of the illicit drugs, such as widely abused methamphetamine, cocaine, heroin, ketamine and morphine. In the NRF spectroscopy, the nuclei are excited by the induced photon beam, and measurement of the characteristic energies of the emitted $$\gamma $$ γ rays from the distinct energy levels in the excited nuclei provides “fingerprints” of the interested elements in the illicit drugs. The element ratio approach is further used to identify drug elemental composition in principle. Monte Carlo simulations show that four NRF peaks from the nuclei $$^{12}$$ 12 C, $$^{14}$$ 14 N and $$^{16}$$ 16 O can be detected with high significance of 7−24$$\sigma $$ σ using an induced photon beam flux of $$10^{11}$$ 10 11 . The ratio of $$^{14}N$$ 14 N /$$^{12}C$$ 12 C and/or $$^{16}O$$ 16 O /$$^{12}C$$ 12 C for illicit drugs inspected are then extracted using the element ratio approach. It is found that the present results of simulations are in good agreement with the theoretical calculations. The feasibility to detect the illicit drugs, inside the 15-mm-thick iron shielding, or surrounded by thin benign materials, is also discussed. It is indicated that, using the state-of-the-art $$\gamma $$ γ -ray source of high intensity and energy-tunability, the proposed method has a great potential for identifying drugs and explosives in a realistic measurement time.

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Section: Methodsmentioning

confidence: 99%

Nuclear resonance fluorescence drug inspection

Lan

Song

Huang

et al. 2021

Sci Rep

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“…In this paper we propose a solution that solves the dead time issue while simultaneously allowing for conventional low-energy spectroscopy within the CSP's saturation limit and for high-resolution spectroscopy up to roughly 20 times the conventional dynamic energy range of the circuit. With a time-over-threshold technique it is in fact possible to retrieve the energy of an event that caused preamplifier saturation with resolution and accuracy compatible with the requisites of γ spectroscopy [8], i.e. in the order of 0.1%, without this measurement being affected by the pre-amplifier baseline fluctuations.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Analog Circuit to Retrieve Energy Information From Signals of Deeply Saturated Preamplifiers Connected to Semiconductor Detectors

Capra

Secci

Pullia

2022

IEEE Trans. Nucl. Sci.

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In nuclear spectroscopy by definition a distorted signal from a saturated pre-amplifier cannot contain the correct energy information, being this one directly related to the signal amplitude. In this work we propose an innovative technique to exploit the charge-conservation principle to extract highresolution energy information from a deeply saturated chargesensitive pre-amplifier connected to semiconductor detectors. The previously described "Fast-Reset" technique enables to reconstruct the energy information from a saturated preamplifier collecting the charge on the input node with a current generator and performing a time-over-threshold measurement. However it requires an off-line post processing of the acquired data. The proposed circuit, instead, requires no post processing thanks to a peculiar Time-to-Amplitude converter that integrates a baseline rejection circuit. In this way an extension of the pre-amplifier spectroscopic energy range of a factor 20 or more is possible, with the generation of a signal whose shape is optimized for direct acquisition with a pulse-height analyzer and no additional filtering.

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Response of AGATA segmented HPGe detectors to gamma-rays up to 15.1 MeV

Cited by 2 publications

References 23 publications

Nuclear resonance fluorescence drug inspection

Nuclear resonance fluorescence drug inspection

An Innovative Analog Circuit to Retrieve Energy Information From Signals of Deeply Saturated Preamplifiers Connected to Semiconductor Detectors

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