Performance of portable TDCR systems developed at LNE-LNHB

Sabot, Benoît; Dutsov, Chavdar; Cassette, P.; Mitev, K.

doi:10.1016/j.nima.2022.166721

Cited by 17 publications

(14 citation statements)

References 17 publications

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“…[ 24 ] This system, micro‐TDCR, was developed and built at LNE‐LNHB and was validated and used for various studies over the last 5 years. [ 21 ] This micro‐TDCR uses 3 PMTs with a maximum quantum yield (43%) between 280 and 420 nm. This measurement set uses specific electronics, which allowed to record the logical sum of the double coincidences ( D ) as well as the triple coincidences ( T ) between the three PMTs with an adjustable coincidence window (here 40 ns or 400 ns) and an extendable dead time of 50 µs.…”

Section: Methodsmentioning

confidence: 99%

“…Then we recorded their scintillation properties in the presence of radioactive gas. To do so, we placed the MOFs inside a metrological device, a triple‐to‐double coincidence ratio (TDCR) counter, [ 21 ] modified to be connected to a metrological radioactive gas test bench. [ 22 ] We showed that scintillating MOFs are an extremely potent solution for detecting medium levels (35 to 250 Bq m −3 ) of our targeted radioactive gases.…”

Section: Introductionmentioning

confidence: 99%

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Detection of Radioactive Gas with Scintillating MOFs

Mauree

Villemot

Sabot

et al. 2023

Adv Funct Materials

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Homogenous radioactive gas contamination constitutes the hardest challenge for radioprotection due to its elusive nature. Most common radioactive gas are 85 Kr, 222 Rn, and tritiated ( 3 H) vapors. Each of them has different challenges, often leading to specialized single-gas detectors. The state-of-the-art detection either produces chemical-radiological waste, is hard to implement online, or requires large volume. A new paradigm is presented for radioactive gas detection that can perform online detection on any gas and fit in the hand. This study use photoluminescent metal organic frameworks (MOFs) as both porous gas sponges and scintillators. The response of several zinc based MOF is studied, using a unique radioactive gas test bench. These tests showed that MOFs are able to both concentrate and detect successfully 85 Kr. The investigation is completed with calibration with different activities. The study also reports detection of 222 Rn, and measurement of its half-life. Finally, the study is completed with the successful detection of tritiated dihydrogen, commonly known to be a hard radionuclide to detect due to its low energy and penetration range. This paper shows that scintillating MOFs are a powerful solid-state approach and a practical solution to the challenge of radioactive gas measurements.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Detection of Radioactive Gas with Scintillating MOFs

Mauree

Villemot

Sabot

et al. 2023

Adv Funct Materials

Self Cite

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“…The light photons produced by scintillation are measured using a metrological device developed to exploit the triple-to-double coincidence ratio (Supplementary Material, Fig. S39), 17 with a specific connection cap adapted to the radioactive gas flow in the scintillator.…”

Section: Methodsmentioning

confidence: 99%

“…1B, Methods). 17 Specifically, the isotope activity has been monitored by recording the logical sum of the double coincidence counting rate of the detectors (Supplementary Material). The coincidence technique can be applied using different coincidence windows where the PMTs are activated in order to be adapted to the decay time of the scintillator to maximize the device's sensitivity.…”

Section: Radioactive Gas Detection With Mofs Nanocrystalsmentioning

confidence: 99%

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Efficient radioactive gas detection by porous metal-organic framework scintillating nanocrystals.

Orfano

Perego

Cova

et al. 2022

Preprint

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Natural radioactive gases and anthropogenic radionuclides such as radon, xenon, hydrogen and krypton isotopes, need to be carefully monitored to be properly managed as pathogenic agents, radioactive diagnostic agents or indicators of nuclear activity. State-of-the-art gas detectors based on liquid scintillators suffer from many drawbacks such as lengthy sample preparation procedures and limited solubility of gaseous radionuclides, which produces a detrimental effect on measurement sensitivity. A potential breakthrough solution to this problem is using solid porous scintillators that act as gas concentrators and, therefore, could increase detection sensitivity. Highly porous scintillating metal-organic frameworks (MOFs) stand out as relevant materials for the realization of these devices. We demonstrate the capability of porous hafnium-based MOF nanocrystals exploiting dicarboxy-9,10-diphenylanthracene (DPA) as a scintillating conjugated ligand to detect gas radionuclides. The nanocrystals show fast scintillation properties in the nanosecond domain, a fluorescence quantum yield of ~40% and an accessible porosity suitable to host noble gas atoms and ions. The adsorption and detection of radionuclides such as 85Kr, 222Rn and 3H have been explored for these MOFs utilising a newly developed device based on a time coincidence technique. MOF nanocrystals demonstrate an improved sensitivity for these radionuclides compared to a reference detector, showing an excellent linear response down to an activity value lower than 1 kBq·m-3 that outperforms commercial devices. These results strongly support the possible use of scintillating porous MOF nanocrystals as the building block of ultrasensitive sensors for detecting natural and anthropogenic radioactive gases.

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Reabsorption‐Free Scintillating Hetero‐Ligand MOF Crystals Activated by Ultrafast Energy Transfer

Orfano,

Perego,

Bezuidenhout

et al. 2024

Adv Funct Materials

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Fast photoluminescence and scintillation with a Stokes shift larger than 1 eV is achieved in hetero‐ligand metal–organic framework (MOF) crystals comprising inorganic linking nodes and fluorescent conjugated ligands. By finely engineering the MOF composition with the use of ligands with strictly complementary emission and absorption properties and highly delocalized molecular electronic orbitals, the singlet excitons diffusion is enhanced through the ligand framework, fully exploiting both Förster and Dexter energy transfer mechanisms. This allows for the sensitization of energy acceptor ligand fluorescence by ultrafast non‐radiative energy transfer with a rate up to the THz range. This efficient antenna effect instantly activates the MOF scintillation with a Stokes shift as large as 1.3 eV in the blue spectral range, matching the highest sensitivity spectral window of the best photodetector available. This is obtained using a minimal doping level of the energy acceptor species, with a consequent elimination of emission re‐absorption that allows the achievement of a 500% increment of the MOFs scintillation efficiency and the detection of the radioactive krypton isotope 85Kr from the gas phase with an improved sensitivity compared with the reference material.

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Performance of portable TDCR systems developed at LNE-LNHB

Cited by 17 publications

References 17 publications

Detection of Radioactive Gas with Scintillating MOFs

Detection of Radioactive Gas with Scintillating MOFs

Efficient radioactive gas detection by porous metal-organic framework scintillating nanocrystals.

Reabsorption‐Free Scintillating Hetero‐Ligand MOF Crystals Activated by Ultrafast Energy Transfer

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