Measurement of tritium with plastic scintillators in large vials of a low background liquid scintillation counter: an organic waste-less method

Furuta, Etsuko; Kato, Yukitaka; S, Fujisawa

doi:10.1007/s10967-017-5408-6

Cited by 11 publications

(1 citation statement)

References 7 publications

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“…Furuta and co-workers reported that atmospheric plasma treatment of the surface of a PS increased the surface contact area with water − and that water was uniformly spread on the surface over a large area of the PS. The detection efficiency of tritiated water (20 μL) having activity from 0.170 kBqL –1 to 80 kBqL –1 increased from 3.4 to 19.5% for 1 plasma-treated sheet of the PS.…”

Section: Introductionmentioning

confidence: 99%

Paper Scintillator Incorporated with Scintillator–Silica Fine Powders: Photophysical Characterization and Proof of Concept Demonstration of Tritium Detection

Miyoshi,

Nakamura,

Tsekrekas

et al. 2024

ACS Omega

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In order to decrease the generation of radioactive waste, it is of interest to develop a scintillator capable of absorbing tritiated solutions for efficient detection of low-energy β-particles from tritium. In this work, paper scintillator incorporated with scintillator−silica fine powders (FPs), which is composed of scintillator−silica nanoparticles (NPs) attached to silica FP, was fabricated and evaluated. The scintillator−silica NPs contained liquid scintillators benzoic acid, 2,5-diphenyloxazole (PPO), and 1,4-bis(5-phenyloxazol-2-yl) benzene (POPOP). Photophysical characterization was executed by means of photoluminescence, fluorescence lifetime, quantum efficiency, and radioluminescence under X-ray excitation. POPOP emission was confirmed by absorbing the emissions from benzoic acid and PPO. Radioluminescence results confirmed POPOP emission. Fluorescence lifetime analysis yielded a 1.29 ± 0.01 ns main fast decay (64.2%) combined with a 4.00 ± 0.04 ns slower decay (35.8%). The combined luminescence results suggested that most POPOP in the paper scintillator was solvated. At 301 nm, the average quantum efficiency from both faces of the paper scintillator was about 4%, and at 370 nm, it was about 11%. The paper scintillator detected 3 H β-particles by dipping the paper scintillator into tritiated water without a liquid scintillator. The counting efficiency depended on water content in the paper scintillator, and it increased to above 10% for tritium activity less than 200 dpm since it was preferentially adsorbed by vapor pressure isotopic effect and isotopic exchanged tritium on the surface of the scintillator−silica FP in the paper scintillator.

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