Non-proportional response of scintillators to alpha particle excitation

Wolszczak, W.; Dorenbos, P.

doi:10.1109/tns.2017.2699327

Cited by 29 publications

(13 citation statements)

References 90 publications

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“…Iodide compounds are then the most likely candidates because they already demonstrated the required scintillation yield with Eu 2þ activation, and the iodides are known to have low intrinsic resolution. [23] In our first attempt, we already achieved a resolution of 3.2% with CsBa 2 I 5 . The data point in Figure 3d shows the current result.…”

Section: 2%mentioning

confidence: 92%

“…This implies that for each of those scintillators, we may add Sm 2+ to shift the emission to wavelengths, where an APD has the maximum sensitivity, and then, it is feasible to go below an energy resolution of 2%. Iodide compounds are then the most likely candidates because they already demonstrated the required scintillation yield with Eu 2+ activation, and the iodides are known to have low intrinsic resolution . In our first attempt, we already achieved a resolution of 3.2% with CsBa 2 I 5 .…”

mentioning

confidence: 94%

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CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

Wolszczak

Krämer

Dorenbos

2019

Physica Rapid Research Ltrs

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Scintillators are materials that absorb a high energy particle (α,β,γ radiation) and downconvert it into a short pulse of visible or near‐visible light. As determined by photon detection statistics, the ultimate energy resolution for γ‐photon detection can only be approached for materials that show a perfect proportional response with γ‐energy. A large amount of research has resulted in the discovery of highly proportional materials, such as SrI2:Eu2+ and CsBa2I5:Eu2+. However, the resolution is still limited because of unavoidable self‐absorption of Eu2+ emission, especially when large‐sized scintillators are to be used. By co‐doping with Sm2+, the emission of Eu2+ can be efficiently shifted to the far‐red by exploiting nonradiative energy transfer. Herein, this new idea is applied to CsBa2I5, and Sm co‐doped CsBa2I5:Eu2+ can be considered as the first “black scintillator” with an emission wavelength around 755 nm, a remarkable high energy resolution of 3.2% at 662 keV gamma excitation, and a scintillation decay time of 2.1 μs. The proposed double‐doping principle can be used to develop an entirely new class of near‐infrared (NIR) scintillators.

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Section: 2%mentioning

confidence: 92%

mentioning

confidence: 94%

CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

Wolszczak

Krämer

Dorenbos

2019

Physica Rapid Research Ltrs

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“…As the quenching of the scintillation light caused by α particles is due to the higher ionization density, such a behavior of the α/β ratio can be explained by the energy dependence of ionization density of particles [211,212]. See recent review [213] on α/β ratio in different scintillators.…”

Section: Response Of Scintillation Detector To γ Quanta β and α Partmentioning

confidence: 99%

Radioactive contamination of scintillators

Danevich

Tretyak

2018

Int. J. Mod. Phys. A

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Low counting experiments (search for double β decay and dark matter particles, measurements of neutrino fluxes from different sources, search for hypothetical nuclear and subnuclear processes, low background α, β, γ spectrometry) require extremely low background of a detector. Scintillators are widely used to search for rare events both as conventional scintillation detectors and as cryogenic scintillating bolometers. Radioactive contamination of a scintillation material plays a key role to reach low level of background. Origin and nature of radioactive contamination of scintillators, experimental methods and results are reviewed. A programme to develop radiopure crystal scintillators for low counting experiments is discussed briefly.

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“…These values are reasonable considering that the light yield exceeds 10,000 photons/MeV [65% anthracene for BC-400 (6) and that the light yield of anthracene for α-rays is 20000 photons/MeV estimated recently with measurements of the Compton edge, (7) or 17400 photons/MeV deduced from the light yields for various scintillators (8) ] and considering that the a/b ratio is less than 0.1 for generic plastic scintillators. (9) As for the dependence on thickness, the pulse height spectra extended toward the largechannel side up to 50 µm. The extension of the spectra indicates an increase in the number of scintillation photons.…”

Section: Methodsmentioning

confidence: 91%

Scintillation Properties and ��-ray Detection Capabilities of Thin-film Plastic Scintillators

Koshimizu

Yanagida

Kamishima³

et al. 2019

Sensors and Materials

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The photoluminescence and scintillation properties of thin-film plastic scintillators of 5-100 µm thicknesses have been analyzed. The photoluminescence and X-ray-induced radioluminescence spectra exhibited a peak at 400-450 nm, which is typical for generic plastic scintillators. As for the radioluminescence spectra, the contribution of the short-wavelength component decreased with the increase in thickness owing to the self-absorption of scintillation photons inside the scintillators themselves. The temporal profiles of scintillation exhibited a fast decay on the order of nanoseconds. The pulse-height spectra of the scintillation detectors equipped with thin-film plastic scintillators were obtained for 5.4 MeV α-rays from 241 Am to evaluate the α-ray detection capabilities. Peaks were observed for thin-film plastic scintillators of 9 and 22 µm thicknesses, and their light yields were estimated to be 830 and 410 photons/MeV, respectively. The dependence of pulse height spectra on film thickness indicates that selfabsorption occurs in such thin films.

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Non-proportional response of scintillators to alpha particle excitation

Cited by 29 publications

References 90 publications

CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

Radioactive contamination of scintillators

Scintillation Properties and ��-ray Detection Capabilities of Thin-film Plastic Scintillators

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Non-proportional response of scintillators to alpha particle excitation

Cited by 29 publications

References 90 publications

CsBa2I5:Eu2+,Sm2+—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

CsBa2I5:Eu2+,Sm2+—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

Radioactive contamination of scintillators

Scintillation Properties and ��-ray Detection Capabilities of Thin-film Plastic Scintillators

Contact Info

Product

Resources

About

CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy

CsBa₂I₅:Eu²⁺,Sm²⁺—The First High‐Energy Resolution Black Scintillator for γ‐Ray Spectroscopy