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Electrolytic enrichment method for tritium determination in the Arctic Ocean using liquid scintillation counter

Acta Oceanologica Sinica 2020年第9期39卷 73-77页

作者： Feng Lin Tao Yu Wen Yu Jialin Ni Li Lin Laboratory of Marine Isotopic Technology and Environmental Risk Assessment Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Laboratory of Marine Biology and Ecology Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China

A method of measuring the tritium in seawater based on electrolytic enrichment and ultra-low background liquid scintillation counting techniques was *** different factors influencing the detection limit were studied,including the counting time,the electrolytic volume of the seawater samples,the selection of background water,scintillation solution and their *** optimizing the parameters and electrolyzing 350 mL volume of samples,the detection limit of the method was as low as 0.10 Bq/*** order to test the optimization of system for this method,of the 84 seawater samples collected from the Arctic Ocean we measured,92%were above the detection limit(the activity of this samples ranged from 0.10 Bq/L to 1.44 Bq/L with an average of(0.30±0.24)Bq/L).In future research,if we need to accurately measure the tritium activity in samples,the volume of the electrolytic samples will be increased to further reduce the minimum detectable activity.

关键词： tritium liquid scintillation cocktails electrolytic enrichment

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Determination of Plutonium Isotopes in Radioactive Waste Contaminated with Uranium and Thorium

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Journal of Environmental Science and Engineering(B) 2023年第3期12卷 128-132页

作者： Raguso Damiano Dell’Omo Emiliano Colavolpe Giulia Gentile Fabiana ITIS Giovanni XXIII State Technical Industrial InstituteRome 00155Italy ITIS G.L.Lagrange State Technical Industrial InstituteRome 00158Italy Department Industrial Chemistry Faculty MM.FF.NN MathematicalPhysical and Natural Sciences of La Sapienza UniversityRome 00185Italy Department Environmental Toxicology Faculty MM.FF.NN MathematicalPhysical and Natural Sciences of La Sapienza UniversityRome 00185Italy

Nucleco is the Sogin Group’s Italian leading company in the sector of radiological services,radioactive waste management,decontamination and reclamation of industrial sites and nuclear power *** is 60%owned by Sogin and 40%by ENEA-National Agency for New *** waste characterization carried out by Nucleco SpA includes a large variety of radionuclides belonging to the gamma,beta and alpha emitter *** determination of Uranium and Plutonium isotopes plays a key role in the waste *** SpA has distinguished itself in characterizations of radioactive waste in complex and nuclear plant *** matrices have large amounts of alpha emitters,in particular isotopes of Uranium,Thorium and Plutonium.A significant presence of U238 results in such a large amount of Th234(and daughters)that interferes with the determination of ***,there is the need of finding a pre-treatment,extraction and subsequent purification technique that would allow Th234 to be detached and thus Pu241 to be determined in complex high-activity *** above elements are extracted using chromatography *** isotope of the element to be analyzed,with known activity,is added at the beginning of the process to determine the extraction *** being eluted into the column,the sample undergoes a series of treatments in order to be purified of any *** method developed by Nucleco involves the oxidation of Pu at valence+6 and the subsequent precipitation,in fluorides form,of the elements with valence+4 and+3(***234).Pu241 is then measured by LSC(liquid scintillation Counting),while the other isotopes are measured by alpha spectrometry after electrodeposition on a metal plate.

关键词： Plutonium thorium purification liquid scintillation LSC alpha emitters beta emitters.

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