How the surface-processing conditions affect the intrinsic luminescence of CsI crystals

Kudin, A. M.; Andryushchenko, L. A.; Gres, V.Yu.; Didenko, Alexander; Charkina, T. A.

doi:10.1364/jot.77.000300

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…Thus, given the range differences for nuclear recoils and α-particles, we expect only such a small percentage. That heavy nuclei interacting in the near-surface layers in undoped CsI can in fact reveal a peculiar LY is further supported by experimental observations discussed in [30][31][32]: they observe an intensive blue luminescence in CsI due to the formation of vacancies as a consequence of e.g. plastic deformation of the crystal.…”

Section: B Experimental Resultssupporting

confidence: 61%

“…Defect surface layers are difficult to remove, especially in case of absence of a cleavage plane, as in CsI. In [32] a surface-removing procedure is discussed which relies on two important steps: first, after mechanical surface treatment of the CsI it has to be stored in ambient air (relative humidity above 30%) to allow for recombination/relaxation of vacancies (O(days)). Second, still remaining impurities and defects may be removed by chemical polishing using e.g.…”

Section: B Experimental Resultsmentioning

confidence: 99%

“…In the frame of introducing cryogenic calorimeters based on an alkali halide target for the search of dark matter particles such kind of surface effect is not of concern. First, as discussed previously, Kudin et al [32] started to develop a recipe to successfully remove defect surface layers. Second, α-induced background has to be prevented in any case, as nuclear recoils can mimic WIMP interactions.…”

Section: B Experimental Resultsmentioning

confidence: 99%

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A CsI low-temperature detector for dark matter search

Angloher

Dafinei

Gektin

et al. 2016

Astroparticle Physics

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Cryogenic detectors have a long history of success in the field of rare event searches. In particular scintillating calorimeters are very suitable detectors for this task since they provide particle discrimination: the simultaneous detection of the thermal and the light signal produced by a particle interaction in scintillating crystals allows to identify the nature of particle, as the light yield depends thereon. We investigate the performance of two large CsI (undoped) crystals (∼122 g each) operated as scintillating calorimeters at milli-Kelvin temperatures in terms of calorimetric properties and background rejection capabilities. Furthermore, we discuss the feasibility of this detection approach towards a background-free future dark matter experiment based on alkali halides crystals, with active particle discrimination via the two-channel detection.

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Section: B Experimental Resultssupporting

confidence: 61%

Section: B Experimental Resultsmentioning

confidence: 99%

Section: B Experimental Resultsmentioning

confidence: 99%

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A CsI low-temperature detector for dark matter search

Angloher

Dafinei

Gektin

et al. 2016

Astroparticle Physics

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“…[3] The deterioration of its performance was first reported by Kerrigan [4] who discovered the development of an amorphous layer on the crystal surface and correlated its thickness to the counting efficiency of the detector. Vydai et al [5] [6] and Kudin [7], studied the scintillation characteristics of CsI(Tl) crystals and attributed the performance deterioration of these detectors to the penetration of quenching impurities at the surface layer due to damages induced in the grinding and polishing processes. Recent studies [8]- [10] on Na activated CsI detectors indicate the detection efficiency of these crystals degrade quite fast in a high humidity condition (80% RH).…”

Section: Introductionmentioning

confidence: 99%

Effect of Humidity on Scintillation Performance in Na and Tl Activated CsI Crystals

Yang

Harmon

Doty

et al. 2014

IEEE Trans. Nucl. Sci.

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Time dependent photoluminescence and radioluminescence for sodium (Na) and thallium (Tl) activated cesium iodide (CsI) single crystals exposed to 50% and 75% relative humidity (RH) has been investigated. These results indicate that Tl activated crystals are more robust than the Na activated crystals against humidity induced scintillation degradation. The development of "etching pits" and "inactive" domains are the characteristics of deteriorated Na activated CsI crystals. These "inactive" domains, bearing a resemblance to a polycrystalline appearance beneath the crystal surface, can be readily detected by a 250 nm light emitting diode. These features are commonly observed at the corners and deep scratched areas where moisture condensation is more likely to occur. Mechanisms contributing to the scintillation degradation in Na activated CsI crystals were investigated by Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). ToF-SIMS depth profiles indicate that Na has been preferentially diffused out of CsI crystal, leaving the Na concentration in these "inactive" domains below its scintillation threshold.

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“…To determine the spectrometric characteristics of scintillator the samples measuring 10×10×10 mm were made for light output determination and ∅20×4 mm for measuring the luminescence. The polishing of the samples was carried out taking into account the recommendations of works [20,21] to prevent the formation of a dead layer. Measurements of the light yield were carried out on a spectrometric bench with a Hamamatsu S3590-08 photodiode relative to the standard.…”

Section: Methodsmentioning

confidence: 99%

SCINTILLATION CHARACTERISTICS OF HEAVILY DOPED CsI:Tl, IO3 CRYSTALS

Shpilinskaya¹,

Кudin²,

Trefilova³

et al. 2019

Problems of Atomic Science and Technology

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The effect of 3 IO− ions on spectrometric characteristic of CsI:Tl crystal has been considered. It has been shown that co-doping of CsI:Tl crystal by 3 IO− anions permits to obtain clear ingots with increased thallium concentration up to CTl ~ 0.9 mole % in which the concentration quenching of photo- or radioluminescence do not observed. It has been shown that the decay of solid solution in CsI:Tl, 3 IO crystals is not observed, at least up to CTl ~ 0.5 mole %, as evidenced by a good energy resolution (R = 6.3%) of samples with the specified Tl concentration and this also evidenced by a larger segregation coefficient of thallium in CsI:Tl, 3 IO crystals (k = 0.24 contrary to k = 0.19 in CsI:Tl). An explanation of thallium solid solution stability in CsI matrix has been proposed which based on experimental fact of complex formation. Compensation of elastic stresses of opposite sign due to complex formation results in preventing of nucleation for solid solution decay.

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How the surface-processing conditions affect the intrinsic luminescence of CsI crystals

Cited by 7 publications

References 9 publications

A CsI low-temperature detector for dark matter search

A CsI low-temperature detector for dark matter search

Effect of Humidity on Scintillation Performance in Na and Tl Activated CsI Crystals

SCINTILLATION CHARACTERISTICS OF HEAVILY DOPED CsI:Tl, IO3 CRYSTALS

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