Cesium Iodide (Csl)

Eldridge, J. E.

doi:10.1016/b978-012544415-6.50084-4

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…The absorption spectrum is thus very narrow, helping to differentiate signal from background. We take σ PE (E) from Henke et al [55,56] and the Handbook of Optical Constants of Solids [57][58][59][60]. Discrepancies of O(50%) exist between different theoretical predictions for σ PE (E) below ∼ 300 eV.…”

Section: Axion-like Particlesmentioning

confidence: 99%

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Searching for dark absorption with direct detection experiments

Bloch

Essig

Tobioka

et al. 2017

J. High Energ. Phys.

170

184

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We consider the absorption by bound electrons of dark matter in the form of dark photons and axion-like particles, as well as of dark photons from the Sun, in current and next-generation direct detection experiments. Experiments sensitive to electron recoils can detect such particles with masses between a few eV to more than 10 keV. For dark photon dark matter, we update a previous bound based on XENON10 data and derive new bounds based on data from XENON100 and CDMSlite. We find these experiments to disfavor previously allowed parameter space. Moreover, we derive sensitivity projections for SuperCDMS at SNOLAB for silicon and germanium targets, as well as for various possible experiments with scintillating targets (cesium iodide, sodium iodide, and gallium arsenide). The projected sensitivity can probe large new regions of parameter space. For axionlike particles, the same current direction detection data improves on previously known direct-detection constraints but does not bound new parameter space beyond known stellar cooling bounds. However, projected sensitivities of the upcoming SuperCDMS SNOLAB using germanium can go beyond these and even probe parameter space consistent with possible hints from the white dwarf luminosity function. We find similar results for dark photons from the sun. For all cases, direct-detection experiments can have unprecedented sensitivity to dark-sector particles.

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Section: Axion-like Particlesmentioning

confidence: 99%

“…We use the Henke calculations, which are favored by experimental data [61], for energies above 30 eV. Below 30 eV, we use the measurements compiled in [57][58][59][60].…”

Section: Axion-like Particlesmentioning

confidence: 99%

Searching for dark absorption with direct detection experiments

Bloch

Essig

Tobioka

et al. 2017

J. High Energ. Phys.

170

184

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“…This luminescence process is called "scintillation". CsI has a wide bandgap, which is a member the I-VII group semiconductor, in a range of 6.1-6.4 eV with light emission of 310 and 420 nm [5][6],…”

Section: Structural and Optical Properties Of Csi:tl Crystalmentioning

confidence: 99%

“…CsI crystal is structured as body center cubic (bcc) with a lattice constant of 0.4566 nm. Its melting point and boiling point are 621 °C and 1,277 °C, respectively [5]. CsI is also a semiconductor compound of the I-VII group with bandgap in a range of 6.1-6.4 eV [5].…”

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confidence: 99%

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EFFECTS OF GAMMA RAY IRRADIATION ON STRUCTURAL AND OPTICAL PROPERTIES OF CsI:Tl CRYSTALS

Sintham

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In this research work, effects of gamma ray irradiation on structural and optical properties of CsI doped with Tl (CsI:Tl), which is a scintillator material used for radiation detector applications, were investigated by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), UV-VIS spectroscopy and X-ray luminescence spectroscopy. The CsI:Tl crystals used in this study were grown by a modified homemade Bridgman-Stockbarger technique with CsI powder precursors purities of 99.999% and 99.9% and with the same amount of Tl in form powder of Tl. It is observed that CsI:Tl crystal grown with the 99.999% CsI powder precursor exhibited a colorless crystal ingot, while a use of the 99.9% CsI powder precursor resulted in an orange CsI:Tl crystal ingot. To verify a uniformity of CsI:Tl crystals, the ingots were divided into three parts: the top, middle and bottom of the ingots. Both the CsI:Tl crystals exhibited a poly crystalline, which has a cubic structure with a lattice constant in the range of 0.453-0.456 nm. Noted that only a bottom part of an orange crystal ingot exhibited a lower crystallinity and showed XRD feature, corresponding to calcite (CaCO3). This results in a merging of the Tl-related state and the CsI bandgap for the orange crystal. To avoid an effect from impurity, the middle part of both the crystal was selected to irradiate by gamma ray, showing an increase of grain size, a higher crystallinity and a decrease of conductivity observed by FESEM images. Moreover, a merging of the Tl-related state and the CsI bandgap, which was observed in the orange crystal before a gamma ray irradiation, was observed in both CsI:Tl crystals after gamma ray irradiation of 5 Gy. X-ray luminescence spectra showed a large reduction of luminescence intensity after one day irradiation of the gamma ray and then it recovered back to a similar intensity compared to that of before gamma ray irradiation of 1.0 Gy after 7 days. Furthermore, an efficiency of radiation detection and an energy resolution of both the CsI:Tl scintillator were detected. It is found that with increasing gamma ray irradiation doses up to 5.0 Gy, an efficiency of radiation detection was decreased, while an energy resolution was not significantly different. Noted that the colorless CsI:Tl crystal shows a higher energy resolution than that of the orange crystal. As a result, effects of gamma ray on both the structural and optical properties of CsI:Tl crystals, which depended on an impurity level, were directly affected on a performance of radiation detection.

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Influence of Si wall thickness of CsI(Tl) micro-square-frustums on the performance of the structured CsI(Tl) scintillation screen in X-ray imaging

Sun

Liu

et al. 2022

Sci Rep

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To improve the detection efficiency of the structured scintillation screen with CsI(Tl) micro-square-frustums based on oxidized Si micropore array template in the case of a period as small as microns, the influence of Si wall thickness of the CsI(Tl) micro-square-frustums on the performance of the structured screen in X-ray imaging was investigated. The results show that when CsI(Tl) at the bottom of the screen is structured, the detective quantum efficiency (DQE) improves at almost all spatial frequency as the top thickness of the Si wall tSi decreases. However, when CsI (Tl) at the bottom of the screen is not structured, the DQE becomes better at low-frequency and worse at high-frequency as tSi decreases. The results can provide guidance for optimizing tSi according to the comprehensive requirements of detection efficiency and spatial resolution in X-ray imaging.

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Cesium Iodide (Csl)

Cited by 4 publications

References 12 publications

Searching for dark absorption with direct detection experiments

Searching for dark absorption with direct detection experiments

EFFECTS OF GAMMA RAY IRRADIATION ON STRUCTURAL AND OPTICAL PROPERTIES OF CsI:Tl CRYSTALS

Influence of Si wall thickness of CsI(Tl) micro-square-frustums on the performance of the structured CsI(Tl) scintillation screen in X-ray imaging

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