University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Juraj Tolgyessy

Abbrev:
Tolgyessy, J.
Other Names:
J. Tölgyessy
Address:
Department of Environmental Science, Slovak Technical University, Bratislava, Slovak Republic
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Citations 10

"Further Studies On Model Radioactive Wastewaters By Reverse Radiometric Flow Injection Analysis"
J. Radioanal. Nucl. Chem. 1997 Volume 22, Issue 2 Pages 255-257
Myint U, Khin Khin Saw, Nang Mo Kham and J. Tölgyessy

Abstract: Rapid, safe and cost effective techniques for study of radiochemical wastes have been investigated by many workers. This work deals with a further study on this aspect by reverse radiometric flow injection analysis (rRFIA) technique. 137Cs and 60Co were determined in model radioactive wastewaters.
Cobalt-60 Cesium-137 Waste Radiochemical Reverse

"Response To The Comments By K. Grudpan On"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 3 Pages 257-261
Myint U and J. Tölgyessy

Abstract: The criticisms of Grudpan (Ibid., 1995, 201, 251) concerning papers by Myint et al. (Ibid., 1994, 187, 117, 179) and Tolgyessy and Harangozo (Ibid., 1993, 176, 113) are refuted in detail.
Radiochemical Letter

"Determination Of Cobalt And Cesium By Stopped-flow RFIA With The Aid Of Multichannel Analyser"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 3 Pages 185-189
Myint U., Thida and J. Tölgyessy

Abstract: The RFIA (radiometric FIA) system described previously (Ibid., 1994, 187, 117) was used with a NaI(Tl) scintillation detector connected to a multichannel analyzer.. The sample solution containing 60Co and 137Cs was injected (0.2, 0.4 or 0.6 ml) into an aqueous carrier stream (0.7 ml/min); the 137Cs activity was measured in the flowing stream, but for the 60Co the flow was stopped for 600 s for activity measurement. The peak heights varied linearly with activity for both analytes.
Cobalt-60 Cesium-137 Radiochemical Scintillation counter Spectroscopy Stopped-flow

"Simultaneous Determination Of Cobalt-60, Iodine-131 And Caesium-137 In Model Radioactive Waste Water By Reverse Radiometric Flow Injection Analysis With The Aid Of A Multichannel Analyser"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 2 Pages 171-176
Myint U, Than Than Soe, Khaing San, Ba Han, Thida, Khin Mg Myoe and J. Tölgyessy

Abstract: H2O (0.3, 0.6, 1.2 or 1.5 ml) was injected into a stream of the sample (1 ml/min) in the radiochemical FIA system described previously (Ibid., 1994, 187, 351), which incorporated a NaI(Tl) detector connected to a multichannel analyzer.. The depths of the reverse FIA peaks for the different volumes of water injected are shown diagrammatically and graphically for 131I, 137Cs and 60Co. Clearly separated peaks for these radioisotopes in a single sample stream upon injection of water are shown, the peak depth for a particular radioisotope being referred to a calibration graph for that radioisotope with the same injection volume of H2O.
Cesium-137 Cobalt-60 Iodine 131 Waste Radiochemical Scintillation counter Spectroscopy Reverse

"Computer Program For Radiometric Flow Injection Analysis"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 2 Pages 143-153
U Myint, Khin Mg Myoe, J. Tölgyessy

Abstract: The program CARFIA (Computer-Aided Radiometric FIA), which was developed for instrument control and data processing in FIA on a PC/XT computer with an interface card for direct reading from the γ-ray counter, has been modified (CARFIAM) for use with a 386 PC/AT computer without an interface card, the data being input from the keyboard instead. Both programs are available from the authors.
Radiochemical Spectroscopy Computer

"The Principle And Preliminary Studies On Sub-super-equivalence Flow Injection Analysis (SSEFIA)"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 2 Pages 105-116
U Myint, J. Lesný, J. Tölgyessy

Abstract: The coupling of sub-super-equivalence isotope-dilution analysis (Klas et al., Radiochem. Radioanal. Lett., 1974, 18, 83; Lesny et al., J. Radioanal. Nucl. Chem., 1988, 28, 443) with radiochemical FIA (Ibid., 1994, 187, 117) (diagram of manifold presented) was evaluated, and shown to be feasible, with the extraction of 109Cd from a buffered aqueous stream into a stream of dithizone solution in CHCl3.
Cadmium-109 Radiochemical Mass spectrometry Sample preparation Extraction Dithizone

"Studies On Some Experimental Parameters Of Radiometric Flow Injection Analysis (RFIA) Using Caesium-137 And Cobalt-60"
J. Radioanal. Nucl. Chem. 1995 Volume 201, Issue 2 Pages 97-103
Myint U, Khin Mg Myoe, Ba Han and J. Tölgyessy

Abstract: The radiochemical FIA system described previously (Ibid., 1994, 187, 117, 179) was used with an NaI(Tl) detector connected to a single-channel analyzer.. The merging-zone and sample-injection modes (loc. cit.) were used for the cited radioisotopes; for both, the optimum tube i.d. was 1 mm.
Cesium-137 Cobalt-60 Radiochemical Scintillation counter Spectroscopy Merging zones

"Radiometric Flow Injection Analysis"
J. Radioanal. Nucl. Chem. 1995 Volume 191, Issue 2 Pages 413-426
U Myint and J. Tölgyessy

Abstract: A review is presented, with sections on the measurement of radioactivity in FIA, types of radiochemical FIA, construction of a radiochemical FIA system, reverse radiochemical FIA, flow injection activation analysis and flow injection radiorelease analysis. (28 references).
Neutron activation analysis Radiochemical Review

"Modified And Reverse Radiometric Flow Injection Analysis"
J. Radioanal. Nucl. Chem. 1994 Volume 187, Issue 3 Pages 179-184
Myint U, Ba Han, Khin Mg Myoe, Aung Kywe, Thida and J. Tölgyessy

Abstract: The radiometric flow injection analyzer. previously described (cf., Ibid., 1994, 187, 117) was modified slightly by using gravity feed of the sample from a burette, with separate control of the liquid height in the burette and the carrier reservoir. The method was tested with use of 137Cs or 60Co solution, with counting of the activity in 10 s periods. Calibration graphs of amount injected against peak height (or peak depth for reverse flow injection) were linear, implying similar peak shapes and dispersions. Solutions containing both radionuclides were also analyzed with use of a NaI(Tl) multichannel analyzer.. The reverse flow injection method seems well suited to the analysis of radioactive waste waters.
Cesium-137 Cobalt-60 Waste Radiochemical Peak shape Reverse

"Radiometric Detection In Flow Injection Analysis (radiometric Flow Injection Analysis)"
J. Radioanal. Nucl. Chem. 1994 Volume 187, Issue 2 Pages 117-122
Myint U, Ba Han, Khin Mg Myoe, Aung Kywe, Thida and J. Tölgyessy

Abstract: The simple single-line manifold described consists of a constant-head gravity feed for carrier water, an injection port [cf. Betteridge et al., Analyst (London), 1978, 103, 897], a mixing coil (coiled plastic tubing), a flow cell [coiled plastic tubing (70-180 cm) on a cardboard backing] and a NaI(Tl) detector with a single-channel analyzer.. The system has been used to determine 60Co
Cobalt-60 Waste Radiochemical Optimization