keyword
https://read.qxmd.com/read/38471302/levels-of-naturally-occurring-radioisotopes-in-local-and-imported-bottled-drinking-water-available-in-qu%C3%A3-bec-city-canada
#1
JOURNAL ARTICLE
Jean-Christophe Tremblay-Cantin, Laurie Martin, Myriame Proulx, Nicholas D Priest, Dominic Larivière
Consumption of local and imported bottled water in Canada has greatly increased during the past three decades. While the presence of natural radioactivity is often overlooked when dealing with the water quality of these bottled products, it could contribute substantially to the uptake of radionuclides especially when sourced from regions with higher radioactivity levels compared to where it is consumed. In this study, the activity of several naturally occurring radionuclides (i.e., 210 Po, 226,228 Ra, 230,232 Th, 234,235,238 U) were measured in bottled water available in Québec, Canada after sample pretreatment and analysis by either radiometric or mass spectrometry approaches...
March 11, 2024: Journal of Environmental Radioactivity
https://read.qxmd.com/read/38471108/temperature-dependence-of-the-ring-opening-of-cyclopropene-imines-on-thorium-metallocenes
#2
JOURNAL ARTICLE
Hemanta Deka, Natalia Fridman, Moris S Eisen
The reactions of two highly strained cyclopropenimine ligands L1H and L2H ( L1H = N 1 ,N 1 ,N 2 ,N 2 -tetraisopropyl-3-iminocycloprop-1-ene-1,2-diamine, L2H = N 1 ,N 1 ,N 2 ,N 2 -tetracyclohexyl-3-iminocycloprop-1-ene-1,2-diamine) with three thorium precursors Cp*2 ThCl2 , Cp*2 Th(Cl)(CH3 ), and Cp*2 Th(CH3 )2 were studied. At -20 °C, L1H and L2H react with Cp*2 ThCl2 to form Th1 ( Th1 = Cp*2 ThCl2 (L1H)) and Th2 ( Th2 = Cp*2 ThCl2 (L2H)), respectively, where the neutral ligand coordinates to the thorium metal center...
March 12, 2024: Inorganic Chemistry
https://read.qxmd.com/read/38457482/-n-aryloxide-amidinate-thorium-complexes
#3
JOURNAL ARTICLE
Hanhua Xu, Ze-Jie Lv, Xiao Chen, Zhenfeng Xi, Junnian Wei
An N -aryloxide-amidine ligand ( 1 ), [ONNO] ligand, integrating phenoxide (PhO- ) and amidine ligands through methylene linkers, was employed in actinide chemistry. Upon reaction of the deprotonated ligand with ThCl4 (DME)2 in ether, the corresponding dimer complex 2 was obtained. Upon treatment of 2 with KCp* (Cp* = Cp(Me)5 ) in tetrahydrofuran, the corresponding {[ONNO]ThIV Cp*(LiCl)}2 ( 4 ) was obtained. In complex 2 , the two ArO- arms bonded from the same ligand to different ThIV centers. In contrast, both ArO- arms coordinated to the same metal center in 4 ...
March 8, 2024: Inorganic Chemistry
https://read.qxmd.com/read/38427152/natural-radionuclides-and-radiological-risk-assessment-in-the-stream-and-river-sediments-of-a-high-background-natural-radiation-area-kanyakumari-india
#4
JOURNAL ARTICLE
Thennaarassan Natarajan, Sarata Kumar Sahoo, Kazumasa Inoue, Hideki Arae, Tatsuo Aono, Masahiro Fukushi
The Kanyakumari coast is known to be a high background natural radiation area due to the placer deposits of heavy minerals such as ilmenite, monazite, and rutile. The Kanyakumari river sediments that could be the source of the elevated amounts of natural radionuclides in the coastal sands have been studied in this paper. The activity concentrations of primordial radionuclides 226 Ra, 232 Th, and 40 K were determined using high-purity germanium (HPGe) gamma-ray spectrometry. The mean activity concentrations of 226 Ra, 232 Th, and 40 K were found to be 75 Bq kg-1 , 565 Bq kg-1 , and 360 Bq kg-1 , respectively...
March 1, 2024: Environmental Monitoring and Assessment
https://read.qxmd.com/read/38399083/the-study-of-radioactive-contaminations-within-the-production-processes-of-metal-titanium-for-low-background-experiments
#5
JOURNAL ARTICLE
Marina Zykova, Elena Voronina, Alexander Chepurnov, Mikhail Leder, Maria Kornilova, Alexey Tankeev, Sergey Vlasov, Alexander Chub, Albert Gangapshev, Ali Gezhaev, Dzhamilya Tekueva, Igor Avetisov
Ultra-low-radioactivity titanium alloys are promising materials for the manufacture of low-background detectors which are being developed for experiments in astroparticle physics and neutrino astrophysics. Structural titanium is manufactured on an industrial scale from titanium sponge. The ultra-low-background titanium sponge can be produced on an industrial scale with a contamination level of less than 1 mBq/kg of uranium and thorium isotopes. The pathways of contaminants during the industrial production of structural titanium were analyzed...
February 9, 2024: Materials
https://read.qxmd.com/read/38393198/simultaneously-recovery-of-thorium-and-tungsten-through-hybrid-electrolysis-nanofiltration-processes
#6
JOURNAL ARTICLE
Geani Teodor Man, Paul Constantin Albu, Aurelia Cristina Nechifor, Alexandra Raluca Grosu, Diana Ionela Popescu Stegarus, Vlad-Alexandru Grosu, Virgil Emanuel Marinescu, Gheorghe Nechifor
The recovery and recycling of metals that generate toxic ions in the environment is of particular importance, especially when these are tungsten and, in particular, thorium. The radioactive element thorium has unexpectedly accessible domestic applications (filaments of light bulbs and electronic tubes, welding electrodes, and working alloys containing aluminum and magnesium), which lead to its appearance in electrical and electronic waste from municipal waste management platforms. The current paper proposes the simultaneous recovery of waste containing tungsten and thorium from welding electrodes...
January 26, 2024: Toxics
https://read.qxmd.com/read/38378948/thorium-iv-antimony-complexes-exhibiting-single-double-and-triple-polar-covalent-metal-metal-bonds
#7
JOURNAL ARTICLE
Jingzhen Du, Kevin Dollberg, John A Seed, Ashley J Wooles, Carsten von Hänisch, Stephen T Liddle
There is continued burgeoning interest in metal-metal multiple bonding to further our understanding of chemical bonding across the periodic table. However, although polar covalent metal-metal multiple bonding is well known for the d and p blocks, it is relatively underdeveloped for actinides. Homometallic examples are found in spectroscopic or fullerene-confined species, and heterometallic variants exhibiting a polar covalent σ bond supplemented by up to two dative π bonds are more prevalent. Hence, securing polar covalent actinide double and triple metal-metal bonds under normal experimental conditions has been a fundamental target...
February 20, 2024: Nature Chemistry
https://read.qxmd.com/read/38364569/tailor-designed-carbon-based-novel-fluorescent-architecture-for-nanomolar-detection-of-radioactive-elements-u-vi-and-th-iv-in-ph-%C3%A2-5-0
#8
JOURNAL ARTICLE
A S Shilpa, T Daniel Thangadurai, G M Bhalerao, Siuli Maji
Highly stable nitrogen-doped Graphene Quantum Dots (N-GQD) functionalized with Pamoic Acid (PA@N-GQD) are utilized for nanomolar detection of radioactive elements, Uranium (VI) and Thorium (IV), in pH ± 5.0. The absorption, fluorescence, crystalline nature, elemental composition, functional groups, and morphological state of as-prepared PA@N-GQD are evaluated by UV-visible absorption, photoluminescence, XRD, XPS, FTIR, HRTEM, FESEM, and AFM characterizations. The aqueous solution of PA@N-GQD is characterized by its spherical morphology, averaging 6...
February 13, 2024: Talanta
https://read.qxmd.com/read/38345921/structures-and-properties-of-high-concentration-doped-th-caf-2-single-crystals-for-solid-state-nuclear-clock-materials
#9
JOURNAL ARTICLE
Qiaorui Gong, Siliang Tao, Chengchun Zhao, Yin Hang, Shining Zhu, Longsheng Ma
Thorium-doped vacuum ultraviolet (VUV) transparent crystals is a promising candidate for establishing a solid-state nuclear clock. Here, we report the research results on high-concentration doping of 232 Th:CaF2 single crystals. The structures, defects, and VUV transmittance performances of highly doped Th:CaF2 crystals are investigated by theoretical and experimental methods. The defect configurations formed by Th and the charge compensation mechanism (Ca vacancy or interstitial F atoms) located at its first nearest neighbor position are mainly considered and studied...
February 12, 2024: Inorganic Chemistry
https://read.qxmd.com/read/38317384/triply-bonded-pancake-%C3%AF-dimers-stabilized-by-tetravalent-actinides
#10
JOURNAL ARTICLE
Luciano Barluzzi, Sean P Ogilvie, Alan B Dalton, Peter Kaden, Robert Gericke, Akseli Mansikkamäki, Sean R Giblin, Richard A Layfield
Aromatic π-stacking is a weakly attractive, noncovalent interaction often found in biological macromolecules and synthetic supramolecular chemistry. The weak nondirectional nature of π-stacking can present challenges in the design of materials owing to their weak, nondirectional nature. However, when aromatic π-systems contain an unpaired electron, stronger attraction involving face-to-face π-orbital overlap is possible, resulting in covalent so-called "pancake" bonds. Two-electron, multicenter single pancake bonds are well known, whereas four-electron double pancake bonds are rare...
February 5, 2024: Journal of the American Chemical Society
https://read.qxmd.com/read/38316388/geochemical-evaluation-ecological-and-human-health-risk-assessment-of-potentially-toxic-elements-in-urban-soil-southern-india
#11
JOURNAL ARTICLE
V Gopal, R R Krishnamurthy, A Indhumathi, Beenu T X Sharon, T S Derlin Priya, K Rathinavel, K Manikanda Bharath, N S Magesh, Ramamoorthy Ayyamperumal
Roadside soil contamination is mostly caused by human-caused pollutant deposition. PTEs are among the many substances that are harmful for both humans and the environment. PTE concentrations in roadside soil in Chennai, southern India, have been determined in this study. To evaluate the seriousness of the threats, more environmental and geochemical indices have been applied. 83 soil samples have been obtained from the study regions and focusing on important roads. Elemental analysis has been analyzed with ED-XRF and sieve-filtered samples focused on PTEs such as arsenic, barium, cobalt, chromium, copper, iron, potassium, nickel, lead, thorium, titanium, zinc, and uranium...
February 3, 2024: Environmental Research
https://read.qxmd.com/read/38299333/separation-of-lead-212-from-natural-thorium-solution-utilizing-novel-sulfonamide-dibenzo-18-crown-6
#12
JOURNAL ARTICLE
Shiquan Cao, Yujia Kang, Huiping Tang, Zhi Chen
The extraction of lead-212 (212 Pb) from radioactive thorium (Th) waste is immensely important, as it serves to mitigate environmental risks associated with radioactive waste and provides a vital source for medical isotopes. To economically extract 212 Pb from thorium, we synthesized a novel extractant known as 2,13-disulfonyldiethylamine dibenzo-18-crown-6 (DSADB18C6). We assessed its performance in isolating Pb(II) by employing stable lead and optimizing the parameters of the extraction system. The results showcased an exceptional ability to extract Pb(II) efficiently...
February 1, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/38261087/assessing-radioactive-contaminants-in-kathmandu-soils-measurement-and-risk-analysis
#13
JOURNAL ARTICLE
Devendra Raj Upadhyay, Gaurab Koirala, Buddha Ram Shah, Suffian Mohamad Tajudin, Raju Khanal
Soil samples from vegetable farmland in densely populated wards of Nepal were analyzed for natural radionuclide levels, employing a NaI(Tl) 3" [Formula: see text] 3" gamma detector. The study aimed to evaluate the causes of radiation risk, attributing it to soil contamination resulting from the rapid urbanization and concretization that followed the earthquake in 2015. The activity concentration of radium-226, thorium-232, and potassium-40 and the ranges observed are 2.080±0.084-33.675±1.356 Bq kg[Formula: see text], 17...
January 23, 2024: Environmental Monitoring and Assessment
https://read.qxmd.com/read/38237435/naturally-occurring-radioactive-materials-in-offshore-infrastructure-understanding-formation-and-characteristics-of-baryte-scale-during-decommissioning-planning
#14
JOURNAL ARTICLE
Amy MacIntosh, Daniel T Oldfield, Dioni I Cendón, Andrew D Langendam, Nicholas Howell, Daryl L Howard, Tom Cresswell
Contaminants, including naturally occurring radioactive material (NORM) of the 238-uranium and 232-thorium decay series, have been recognized as a global research priority to inform offshore petroleum infrastructure decommissioning decisions. This study aimed to characterize pipeline scale retrieved from a decommissioned subsea well tubular pipe through high-resolution elemental mapping and isotopic analysis. This was achieved by utilizing transmission electron microscopy, Synchrotron x-ray fluorescence, photostimulated luminescence autoradiography and Isotope Ratio Mass Spectrometry...
January 15, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38218470/influence-of-global-warming-and-industrialization-on-coral-reefs-a-600-year-record-of-elemental-changes-in-the-eastern-red-sea
#15
JOURNAL ARTICLE
Chunzhi Cai, Nicholas Matthew Hammerman, John M Pandolfi, Carlos M Duarte, Susana Agusti
The Red Sea has been recognized as a coral reef refugia, but it is vulnerable to warming and pollution. Here we investigated the spatial and temporal trends of 15 element concentrations in 9 coral reef sediment cores (aged from the 1460s to the 1980s AD) to study the influence of global warming and industrialization on the Eastern Red Sea coral reefs. We found Na, Ca, Cr, Fe, Co, Ni, and Sr concentrations were higher in the northern Red Sea (i.e., Yanbu), whereas Mg, P, S, Mn, and Cd concentrations were higher in the southern Red Sea (i...
January 11, 2024: Science of the Total Environment
https://read.qxmd.com/read/38197922/internal-dose-rate-due-to-intake-of-uranium-and-thorium-by-fish-from-a-dam-reservoir-associated-with-a-uranium-mine-in-brazil
#16
JOURNAL ARTICLE
Wagner de Souza Pereira, Alphonse Kelecom, José Marques Lopes, Maxime Charles-Pierre, Alessander Sá do Carmo, Alexandre Kuster Paiva, Samuel Queiros Pelegrinelli, Wilson Seraine Silva Filho, Lucas Faria Silva, Ademir Xavier da Silva
Uranium mining can cause environmental impacts on non-human biota around mine sites. Because of this, the reduction in non-human biota exposure becomes an important issue. Environmental radioprotection results from the evolution of human radioprotection; it is based on dose rate to non-human biota and uses, as a biological target, and has harmful effects on populations. In the present study, a flooded impoundment created following dam construction in a uranium mine plant undergoing decommissioning was investigated...
January 10, 2024: Radiation and Environmental Biophysics
https://read.qxmd.com/read/38170623/cyclopentadienyl-capped-thorium-iv-porphyrinoid-complex
#17
JOURNAL ARTICLE
Daniel N Mangel, James T Brewster, Gabriel J Juarez, Vincent M Lynch, Jonathan L Sessler
The reaction between Th(IV) dipyriamethyrin dichloride and sodium cyclopentadienyl (Cp) results in the formation of a cyclopentadienyl capped thorium dipyriamethyrin complex, which to our knowledge represents the first expanded porphyrin f-element Cp complex.
January 3, 2024: Chemical Communications: Chem Comm
https://read.qxmd.com/read/38126846/estimation-of-natural-radioactivity-in-the-soil-samples-around-the-uranium-site-royal-village-khandela-sikar-district-rajasthan
#18
JOURNAL ARTICLE
Nitin K Bawalia, Dalpat Meena, Shailendra K Gupta, Pushpa Meena, Surendra Degra, Vijaypal Yadav, Ramkumar Meena, Raveena Malviya
The measurements of activity concentration of radium ( 226Ra ), thorium ( 232Th) and potassium ( 40K ) natural radionuclides using high purity germanium ( HPGe ) detector to assess harmful effects on people residing around Royal Uranium Site, Sikar, Rajasthan, India. The activity concentrations range from 29.03 ± 3.72 to 69.95 ± 4.07 Bq/kg for 226Ra with a mean value of 47.01 Bq/kg, 57.99 ± 6.13 to 113.94 ± 6.54 Bq/kg with a mean value of 86...
December 21, 2023: Radiation Protection Dosimetry
https://read.qxmd.com/read/38109877/evaluation-of-adsorptive-capture-and-release-efficiency-of-mnps-sa-cu-mof-composite-beads-toward-u-vi-and-th-iv-ions-from-an-aqueous-media
#19
JOURNAL ARTICLE
Manish Sharma, Priya Sharma, Vikash Chandra Janu, Ragini Gupta
Effluent from nuclear power plants, rocks, and minerals contains hazardous radionuclides that adversely affect human health and seriously threaten the environment. To address this issue, simple, economic, and sustainable magnetite nanoparticle loaded sodium alginate copper metal-organic framework composite beads (MNPs-SA@Cu MOF composite beads) have been designed, and their performance has been evaluated under varying conditions of pH, time, adsorbent dose, and initial concentration and have been studied by batch adsorption studies for optimizing the adsorption conditions...
December 18, 2023: Langmuir: the ACS Journal of Surfaces and Colloids
https://read.qxmd.com/read/38100190/two-electron-redox-reactivity-of-thorium-supported-by-redox-active-tripodal-frameworks
#20
JOURNAL ARTICLE
Fang-Che Hsueh, Damien Chen, Thayalan Rajeshkumar, Rosario Scopelliti, Laurent Maron, Marinella Mazzanti
The high stability of the +4 oxidation state limits thorium redox reactivity. Here we report the synthesis and the redox reactivity of two Th(IV) complexes supported by the arene-tethered tris(siloxide) tripodal ligands [(KOSiR2Ar)3-arene)]. The two electron reduction of these Th(IV) complexes generates the doubly reduced [KTh((OSi(OtBu)2Ar)3-arene)(THF)2] (2OtBu) and [K(2.2.2-cryptand)][Th(OSiPh2Ar)3-arene)(THF)2](2Ph-crypt) where the formal oxidation state of Th is +II. Structural and computational studies indicate that the reduction occurred at the arene anchor of the ligand...
December 15, 2023: Angewandte Chemie
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