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001-es BibID:	BIBFORM119494
035-os BibID:	(WoS)000813726700001 (Scopus)85140072614
Első szerző:	Molnár Anita
Cím:	Determination of the total 14c concentration of water samples using the COD method and AMS / Molnár Anita, Molnár Mihály, Veres Mihály, Czébely Andrea, Rinyu László, Rozmanitz Péter Jakab, Janovics Róbert
Dátum:	2022
ISSN:	0033-8222
Megjegyzések:	Radiocarbon (14C) is the one of the most important radionuclides released from the nuclear facilities to the environment. Currently, inorganic 14C is checked during regular environmental monitoring as part of the groundwater monitoring program of the Paks Nuclear Power Plant. Several studies have shown that organic 14C can be also an important and sensitive tool for detection of possible leakage of nuclear technological systems. For this reason, a wet oxidation method was developed for the accelerator mass spectrometry (AMS) 14C measurement technique to determine the 14C activity concentration of the total dissolved carbon content of water samples, coming from environmental monitoring wells. The overall efficiency of the oxidation was around 94 ? 5% for different types of tested organic compounds. The typical 14C background (1?2 pMC) is obtained by preparation of blank samples, which allows a detection level of around 5?10?5 Bq L?1. The activity of the organic fraction can be calculated using the formula presented in the study. The method was applied for water samples deriving from environmental monitoring wells of a pressurized-water reactor (PWR) type of NPP. The results of our investigations over the 14 different water samples around the Paks NPP show that DO14C contribution to the total 14C activity concentration was between 5-25%.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk AMS COD groundwater nuclear power plant total dissolved 14C.
Megjelenés:	Radiocarbon. - 64 : 5 (2022), p. 1065-1074. -
További szerzők:	Molnár Mihály Veres Mihály (fizikus) Czébely Andrea (1983-) (biológus) Rinyu László (fizikus) Rozmanitz Jakab Péter Janovics Róbert (1984-) (környezetkutató)
Pályázati támogatás:	KDP_2020 Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM113565
035-os BibID:	(WoS)000939642700001 (Scopus)85152746736
Első szerző:	Varga Tamás (biotechnológus)
Cím:	Intercomparison exercise on fuel samples for determination of biocontent ratio by 14c accelerator mass spectrometry / Tamás Varga, Irka Hajdas, Lucio Calcagnile, Gianluca Quarta, István Major, A. J. Timothy Jull, Anita Molnár, Mihály Molnár
Dátum:	2023
ISSN:	0033-8222
Megjegyzések:	The method of determining the biobased carbon content in liquid fuel samples is standardized, but different laboratories use different protocols during sample preparation and perform the measurements using different machines. The accelerator mass spectrometry (AMS) laboratories use different combustion, preparation, and graphitization methods for the graphite production for the spectrometric measurements. As a result, the intercomparison between the laboratories is inevitable to prove precision and accuracy and to demonstrate that the results are comparable. In this study, we present the results of an intercomparison campaign involving three 14 C accelerator mass spectrometry laboratories. Five samples were used in the measurement campaign, including two biocomponents (fatty acid methyl ester, hydrotreated vegetable oil), one fossil component (fossil diesel), and two blends (mixtures of fossil and biocomponent with 90?10% mixing ratio) in the laboratories of CEDAD (Italy), ETH (Switzerland), and INTERACT (Hungary). The results presented by the laboratories are comparable, and all three laboratories could determine the biobased carbon content of the samples within 1% relative uncertainty, which is acceptable in the scientific, economic, and industrial fields for biocomponent determination.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk AMS biobased carbon content liquid fuel radiocarbon
Megjelenés:	Radiocarbon. - 65 : 2 (2023), p. 539-548. -
További szerzők:	Hajdas Irka Calcagnile, Lucio Quarta, Gianluca Major István (1985-) (környezetkutató) Jull, A. J. Timothy (1951-) (radiocarbon scientist) Molnár Anita (1989-) Molnár Mihály
Pályázati támogatás:	GINOP-2.3.4-15-2020-00007 GINOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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