SPEIR: A Ge Compton camera

Mihailescu, Lucian; Vetter, K.; Burks, M.; Hull, Ethan L.; Craig, William W.

doi:10.1016/j.nima.2006.09.111

Cited by 53 publications

(23 citation statements)

References 27 publications

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“…Many aspects of physics, such as electron correlations [1,2], electron momentum distributions [3][4][5], Fermi surfaces [6], X-ray, and gamma-ray radiations [7][8][9], have been revealed through them. Moreover, Compton scatterings have been utilized to develop the modern gammaray spectrometer and imaging devices [10][11][12]. For convenience, Compton scattering is conventionally approached using the Klein-Nishina formula from free electron approximation (FEA) [13,14].…”

Section: Introductionmentioning

confidence: 99%

Relativistic impulse approximation in Compton scattering

Qiao

Chi²,

Zhang

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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Relativistic impulse approximation (RIA) has been widely used in atomic, condensed matter, nuclear, and elementary particle physics. In former treatments of RIA formulation, differential cross sections for Compton scattering processes were factorized into atomic Compton profiles by performing further simplified approximations in the integration. In this study, we develop an "exact" numerical method without using any further simplified approximations or factorization treatments. The validity of the approximations and factorizations used in former RIA treatments can be tested using our approach. Calculations for C, Cu, Ge, and Xe atomic systems are carried out using Dirac-Fock wavefunctions, and comparisons between the proposed approach and former treatments of RIA are performed and discussed in detail. Numerical results indicate that these simplified approximations work reasonably in the Compton peak region, and our results have little difference with the best of the former RIA treatments in the entire energy region. While in regions far from the Compton peak, the RIA results become inaccurate, even when our "exact" numerical treatment is used.

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Section: Introductionmentioning

confidence: 99%

Relativistic impulse approximation in Compton scattering

Qiao

Chi²,

Zhang

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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“…It is also important that the devices be sensitive to energetic, highly penetrating radiation, to support a number of important radiation detection applications which require a combination of high-resolution and spatially dependent charge deposition measurements. [38][39][40] To address those needs, we performed an experiment utilizing an X-ray microbeam facility provided by the Advanced Photon Source at Argonne National Laboratory. The results offer insight into the positiondependent response of GFETs to high-energy (>keV) photon irradiation.…”

mentioning

confidence: 99%

Position sensitivity of graphene field effect transistors to X-rays

Cazalas

Sarker

Moore

et al. 2015

Applied Physics Letters

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Device architectures that incorporate graphene to realize detection of electromagnetic radiation typically utilize the direct absorbance of radiation by graphene. This limits their effective area to the size of the graphene and their applicability to lower-energy, less penetrating forms of radiation. In contrast, graphene-based transistor architectures that utilize the field effect as the detection mechanism can be sensitive to interactions of radiation not only with graphene but also with the surrounding substrate. Here, we report the study of the position sensitivity and response of a graphene-based field effect transistor (GFET) to penetrating, well-collimated radiation (micro-beam X-rays), producing ionization in the substrate primarily away from graphene. It is found that responsivity and response speed are strongly dependent on the X-ray beam distance from graphene and the gate voltage applied to the GFET. To develop an understanding of the spatially dependent response, a model is developed that incorporates the volumetric charge generation, transport, and recombination. The model is in good agreement with the observed spatial response characteristics of the GFET and predicts a greater response potential of the GFET to radiation interacting near its surface. The study undertaken provides the necessary insight into the volumetric nature of the GFET response, essential for development of GFET-based detectors for more penetrating forms of ionizing radiation.

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“…Assuming that the energy E of the incident γ-ray is known, the uncertainty on the Compton angle δθ can be approximated by the following analytic expression (see Ref. [7]),…”

Section: Dynamic Electronic Collimationmentioning

confidence: 99%

First i-TED demonstrator: A Compton imager with Dynamic Electronic Collimation

Babiano

Balibrea

Caballero

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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i-TED consists of both a total energy detector and a Compton camera primarily intended for the measurement of neutron capture cross sections by means of the simultaneous combination of neutron time-of-flight (TOF) and γray imaging techniques. TOF allows one to obtain a neutron-energy differential capture yield, whereas the imaging capability is intended for the discrimination of radiative background sources, that have a spatial origin different from that of the capture sample under investigation. A distinctive feature of i-TED is the embedded Dynamic Electronic Collimation (DEC) concept, which allows for a trade-off between efficiency and image resolution. Here we report on some general design considerations and first performance characterization measurements made with an i-TED demonstrator in order to explore its γ-ray detection and imaging capabilities.

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SPEIR: A Ge Compton camera

Cited by 53 publications

References 27 publications

Relativistic impulse approximation in Compton scattering

Relativistic impulse approximation in Compton scattering

Position sensitivity of graphene field effect transistors to X-rays

First i-TED demonstrator: A Compton imager with Dynamic Electronic Collimation

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