A Scintillating Gas Detector for 2d Dose Imaging in Proton, Alpha or Carbon Ion Beams for Particle Radiotherapy

Seravalli, Enrica; Kreuger, R.; Schippers, Marco; Eijk, Cwe van; Huizenga, J.; Boer, M. de; Geurink, F

doi:10.1016/s0167-8140(12)72879-7

Cited by 2 publications

(2 citation statements)

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“…The hole size affects not only the field strength, but also the field configuration (Bachmann et al 1999). The distribution of strong and weaker electric field regions, as encountered by the traversing electrons, may play a role since the crosssections for excitation and ionization have a different field strength dependence (Seravalli 2008). If the excitation of Ar and CF 4 is more probable than their ionization in small-hole field configurations, then more light quanta could be produced with respect to the electrons.…”

Section: Q Cmentioning

confidence: 99%

Characterization of a scintillating GEM detector with low energy x-rays

Seravalli¹,

Boer²,

Geurink³

et al. 2008

Phys. Med. Biol.

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A two-dimensional position-sensitive dosimetry system based on a scintillating gas detector is being developed with the aim of using it for pre-treatment verification of dose distributions in charged particle therapy. The dosimetry system consists of a chamber filled with an Ar/CF 4 scintillating gas mixture, inside which two cascaded gas electron multipliers (GEMs) are mounted. A GEM is a thin kapton foil with copper cladding structured with a regular pattern of sub-mm holes. In such a system, light quanta are emitted by the scintillating gas mixture during the electron avalanches in the GEM holes when radiation traverses the detector. The light intensity distribution is proportional to the energy deposited in the detector's sensitive volume by the beam. In the present work, we investigated the optimization of the scintillating GEM detector light yield. The light quanta are detected by means of a CCD camera or a photomultiplier tube coupled to a monochromator. The GEM charge signal is measured simultaneously. We have found that with 60 μm diameter double conical GEM holes, a brighter light signal and a higher electric signal are obtained than with 80 μm diameter holes. With an Ar + 8% CF 4 volume concentration, the highest voltage across the GEMs and the largest light and electric signals were reached. Moreover, we have found that the emission spectrum of Ar/CF 4 is independent of (1) the voltages applied across the GEMs, (2) the x-ray beam intensity and (3) the GEM hole diameter. On the other hand, the ratio of Ar to CF 4 peaks in the spectrum changes when the concentration of the latter gas is varied.

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Section: Q Cmentioning

confidence: 99%

Characterization of a scintillating GEM detector with low energy x-rays

Seravalli¹,

Boer²,

Geurink³

et al. 2008

Phys. Med. Biol.

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show abstract

“…Micro-pattern gas detectors (MPGDs) are widely used in various applications such as high-energy physics experiments [1][2][3], neutron detectors [4,5], space dosimetry [6], soft X-ray imaging [7][8][9], directional dark matter searches [10], observation of the Migdal effect in neutron scattering with application to direct dark matter searches [11], hadron therapy dosimetry [12,13], and others [14], due to their good spatial resolution, suitability for measuring high-LET radiation, ability in particle tracking, relatively low cost for economically instrumenting large detection areas and low sensitivity to high-energy photons. MPGDs create a high electric field between a small gap of electrodes, which induces an electron avalanche and amplifies the signal.…”

Section: Introductionmentioning

confidence: 99%

High-tolerance nickel metalized glass gas electron multiplier: development and performance evaluation

Fujiwara,

Shimodan,

A. Majewski

et al. 2023

J. Inst.

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Micro-patterned gas detectors (MPGDs) are an important type of gaseous detector that can amplify and detect a small amount of electric charge generated by the interaction between radiation and gas. These detectors have high gain and high spatial resolution, making them useful in various applications ranging from high energy physics to medical instrumentation. However, one of the most widely used MPGDs, Gaseous Electron Multipliers (GEMs), may often experiences electrical discharges due to excessive electric field in the small space, which reduces their durability. To address this issue, we previously have developed a new type of GEM that uses glass as the insulator instead of conventional materials. Our glass GEM demonstrated excellent gas gain and energy resolution characteristics. In this work, we used nickel as the electrode, which has a higher melting point than copper and showed higher durability against arc discharges. Moreover, the nickel glass GEM performed comparably to conventional Cu-based glass GEMs in evaluation using radiation isotopes. Our findings suggest that our new glass GEM with nickel electrodes is a promising solution to the durability problem of conventional GEMs. This could lead to improvements in the performance and longevity of MPGDs, which could have significant implications for various applications in the fields of physics, engineering, and medicine.

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A Scintillating Gas Detector for 2d Dose Imaging in Proton, Alpha or Carbon Ion Beams for Particle Radiotherapy

Cited by 2 publications

References 0 publications

Characterization of a scintillating GEM detector with low energy x-rays

Characterization of a scintillating GEM detector with low energy x-rays

High-tolerance nickel metalized glass gas electron multiplier: development and performance evaluation

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