EnvironMICADAS C-14 AMS Gas ion source performance and its applications at HEKAL Laboratory, Debrecen, Hungary

<p>A coupled accelerator mass spectrometer - gas interface system successfully has been operating at the Hertelendi Laboratory of Environmental Studies, Debrecen, Hungary since 2013. Over the last 6 years more than 500 gas targets were measured below 100 &#181;g carbon content for carbon isotopic composition. The system was tested with blanks, OxII, IAEA-C1, IAEA-C2 and IAEA-C7 standards. The performance of our instrumentation shows good agreement with other published gas-interface system data and also shows a quite good agreement with the nominal value of international standard samples.&#160; There is a measurable but quite small memory effect after modern samples, but this does not significantly affect the final results. Typical ion currents at the low energy side were between 10-15 &#181;A with a 5% CO₂ in He mixing ratio. The relative errors average &#177;6% for samples greater than or equal to 10 &#181;gC sample with mean count rates of 300 counts per microgram C for OxII. The blank is comparable with other systems, which is 0.0050 &#177; 0.0018 F¹⁴C or 34000-47000 yr BP, which allows for the routine measurement of both of small environmental and archeological samples.</p><p>The research was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund in the project of GINOP-2.3.2-15-2016- 00009 &#8220;ICER&#8221;. This work was carried out in the frame of the J&#225;nos Bolyai Research Scholarship (Mih&#225;ly Moln&#225;r) of the Hungarian Academy of Sciences</p>