Radiocarbon level in the Atmosphere of Ramnicu Valcea, Romania

Radiocarbon ◽  
2019 ◽  
Vol 61 (6) ◽  
pp. 1625-1632
Author(s):  
I Faurescu ◽  
C Varlam ◽  
I Vagner ◽  
D Faurescu ◽  
D Bogdan ◽  
...  
Keyword(s):  
Nuclear Energy ◽  
Liquid Scintillation ◽  
Continuous Production ◽  
Industrial Area ◽  
Chemical Plants ◽  
Direct Absorption ◽  
Tree Leaves ◽  
Energy Research ◽  
Experimental Project ◽  
Wild Vegetation

ABSTRACTThis paper presents radiocarbon (14C) variations in the atmosphere from Ramnicu Valcea, Romania. The samples were collected in the vicinity of the Experimental Pilot Plant for Tritium and Deuterium Separation (PESTD) from the Institute of the Cryogenics and Isotopic Technologies (ICSI) placed about 10 km south from the Ramnicu Valcea city (Romania), in the Govora industrial area. This facility is an experimental project in the national nuclear energy research program, which has the aim of developing technologies for tritium separation from heavy water. It should be noted that in the Govora industrial area operates a 315 MW coal-fired thermoelectric power plant and two chemical plants. In order to determine radiocarbon activity in the atmosphere, samples were collected monthly by absorption of CO2 into sodium hydroxide (NaOH) at Ramnicu Valcea. In addition, control materials (tree leaves, wild vegetation, and grapes), known activity standards, and process blanks (marble) were analyzed. Radiocarbon measurements were performed using the direct absorption method and liquid scintillation counting. The measured Δ14C levels varied between –57‰ and 61‰. The results have a decreasing trend, but due to local influence caused by the continuous production of fossil CO2, we cannot observe Δ14C seasonal variations.

The Brazilian AMS Radiocarbon Laboratory (LAC-UFF) and the Intercomparison of Results with CENA and UGAMS

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 325-330 ◽  
Author(s):  
K D Macario ◽  
P R S Gomes ◽  
R M Anjos ◽  
C Carvalho ◽  
R Linares ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Latin America ◽  
Liquid Scintillation Counting ◽  
Nuclear Energy ◽  
Liquid Scintillation ◽  
Scintillation Counting ◽  
Physics Institute ◽  
University Of Georgia ◽  
The University ◽  
Good Agreement

After 22 yr of the low-level liquid scintillation counting 14C laboratory at the Center for Nuclear Energy in Agriculture (CENA) at São Paulo University (USP), Piracicaba, Brazil, and several collaborative projects with Brazilian and international researchers from distinct scientific areas, the first 14C accelerator mass spectrometry (AMS) laboratory in Latin America was installed at the Physics Institute of the Universidade Federal Fluminense (UFF), Niterói, Brazil. A 250kV single stage accelerator produced by National Electrostatics Corporation began its operation in 2012. In this work, we compare measurements performed at the AMS Radiocarbon Laboratory at UFF (LAC-UFF) with those performed at CENA and the University of Georgia (UGAMS), Georgia, USA. All the results obtained from distinct inorganic and organic samples were in very good agreement.

scholarly journals UK nuclear energy: Research plans scrutinized

Nature ◽  
1984 ◽  
Vol 308 (5961) ◽  
pp. 678-679
Author(s):  
Tim Beardsley
Keyword(s):  
Nuclear Energy ◽  
Energy Research

Development of SOFC Technology at Taiwan Institute of Nuclear Energy Research

2017 ◽  
pp. 1-17
Author(s):  
Ruey-Yi Lee ◽  
Yung-Neng Cheng ◽  
Tai-Nan Lin ◽  
Chang-Sing Hwang ◽  
Ning-Yih Hsu ◽  
...  
Keyword(s):  
Nuclear Energy ◽  
Energy Research

scholarly journals Direct Absorption Method and Liquid Scintillation Counting for Radiocarbon Measurements in Organic Carbon from Sediments

Radiocarbon ◽  
2010 ◽  
Vol 52 (2) ◽  
pp. 794-799 ◽  
Author(s):  
Ionut Faurescu ◽  
Carmen Varlam ◽  
Ioan Stefanescu ◽  
Stela Cuna ◽  
Irina Vagner ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Liquid Scintillation ◽  
Specific Activity ◽  
Potassium Dichromate ◽  
Isotopic Fractionation ◽  
Raw Material ◽  
Total Carbon ◽  
Wet Oxidation ◽  
Direct Absorption ◽  
Absorption Method

In this paper, we investigate a procedure for radiocarbon determination in forest soil and slurry from lake sediments. The total carbon in these samples can be both inorganic and organic. Inorganic carbon can be analyzed in a straightforward manner using the direct absorption method by sample acidification and CO2 capture. For organic carbon, we investigate a hybrid method using the wet-oxidation of organic carbon followed by direct absorption. To evaluate the wet-oxidation processes with potassium dichromate (K2Cr2O7) and potassium permanganate (KMnO4), we performed several experiments using different quantities of soil and sediments in order to establish the quantity of CO2 for each type of sample. The 2 methods offer comparable results for 14C-specific activity (about 0.234 ± 0.024 Bq/g C), values that are expected for these kinds of samples. We also investigated the possibility of isotopic fractionation occurring during CO2 production from raw material by measuring δ13C levels from samples and obtained CO2.

(JAERI) 5th International Symposium on Advanced Nuclear Energy Research

1993 ◽  
Vol 30 (8) ◽  
pp. 837-842
Author(s):  
Satoru FUNAHASHI ◽  
Eiji SHIRAI ◽  
Yukio MORII ◽  
Tsuneo KODAIRA ◽  
Hidetake TAKAHASHI
Keyword(s):  
International Symposium ◽  
Nuclear Energy ◽  
Energy Research
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