Comparison of hydrogen and deuterium adsorption on Pd(100)

Gladys, M. J.; Kambali, Imam; Karolewski, M.A.; Soon, Aloysius; Stampfl, Catherine; O’Connor, D. J.

doi:10.1063/1.3292686

Cited by 21 publications

(13 citation statements)

References 36 publications

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“…The metal alloy has been an interesting material in medical radionuclide production studies [14][15][16]. The 11-MeV proton beams produced by the cyclotron hit the 50-µm Havar foil, which result in 56 Fe(p,n) 56 Co nuclear reaction as theoretically calculated and experimentally observed in previous studies [17][18][19][20]. Nuclear reactions between the 11-MeV proton beams and the rest of the Havar's individual atoms were not experimentally observed, though they could potentially generate secondary neutrons at low neutron fluxes.…”

Section: Havar Windowmentioning

confidence: 82%

A Novel Method for 57/Ni and 57/Co Production using Cyclotron-Generated Secondary Neutrons

Suryanto

Kambali

2018

Atom Indo.

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Ni 57 Co Cyclotron Secondary neutron Nuclear medicine TALYS code 57 Ni and 57 Co radioisotpes are used in the synthesis of radiopharmaceuticals, for research purposes, as well as radiotherapy in nuclear medicine due to its decay characteristics. In this research, 57 Ni and 57 Co were produced using secondary neutrons. The secondary neutrons employed in this investigation were generated by bombarding 11 MeV protons into a target system consisting of Havar  foil as a vacuum window, aluminum foil as an energy degrader, aluminum tube as a target holder and nickel foil as a target via (p,n), (n,n) and (n,2n) nuclear reactions. The TALYS-calculated data were used to understand the origin of the secondary neutrons. In this experiment, variable Ni target thicknesses of 75, 150 and 225 m were irradiated with a fixed proton beam dose of 0.67 Ahr in order to study the dependence of the radioisotope yields on the target thickness. For the first time, 57 Ni and 57 Co radioisotopes were produced and observed experimentally following 58 Ni(n,2n) 57 Ni → 57 Co nuclear reaction. Experimental results indicated that for 225-m thick Ni target, the 57 Ni yield of 10.85 ± 3.29 Ci/Ahr and 57 Co yield of 6.04 ± 2.45Ci/Ahr were recorded after an hour cooling period. The resulted yields did not strongly depend on the target thickness. This proposed novel method is a promising method to obtain higher radioactivity yield in the production of 57 Ni and 57 Co radioisotopes.

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Section: Havar Windowmentioning

confidence: 82%

A Novel Method for 57/Ni and 57/Co Production using Cyclotron-Generated Secondary Neutrons

Suryanto

Kambali

2018

Atom Indo.

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“…The behavior of the 11 MeV proton as it passes through the Havar window and in the enriched H2 18 O target was simulated using the Stopping and Range of Ions in Matter (SRIM) 2013 codes (Ziegler et al, 2010), whereas the energy of possible atomic impurities recoiled off the Havar window was examined using both the SRIM 2013 calculated data and the atomic collision equation, which has also been applied in deuterium and hydrogen adsorption studies (Kambali et al, 2008;Gladys et al, 2010;Kambali et al, 2018a;Kambali et al, 2018b;Kambali et al, 2018c). Moreover, collisions between recoiled off cobalt atoms and the silver (Ag) body housing the enriched water target were also simulated to study the origins of the impurities found in the post-irradiated enriched water target.…”

Section: Recoiling and Sputtering Calculationsmentioning

confidence: 99%

“…Fluorine-18 can be produced via 18 O(p,n) 18 F nuclear reaction, in which an enriched water (H2 18 O) target is bombarded by relatively low to medium energy protons (Hjelstuen et al, 2011) in a target system. The target system usually consists of a target body made of silver and a Havar window separating the cyclotron chamber from the target (Kambali et al, 2010;Kambali et al, 2016), although a niobium (Nb)-based window has also been used (Köhler et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Recoiled and Sputtered Radioactive Impurities in 11 MeV Proton-based F-18 Production

Kambali¹,

Suryanto²,

Parwanto³

et al. 2019

IJTech

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One of the quality control measures in F-18 radionuclide production concerns the impurities which might be present in the proton-irradiated enriched H2 18 O target. In this investigation, proton irradiations of enriched water targets were theoretically simulated by the Stopping and Range of Ions in Matter (SRIM) 2013 codes, followed by experimental measurements. First, the SRIM-calculated data were employed to understand the origins of the recoiled and sputtered species. Using a portable Gamma Ray Spectroscopy System, recoiled and sputtered radioactive impurities were measured in the enriched water target following F-18 production using 11 MeV proton beams. The experimental results indicate that Havar window-originated Co-56 radionuclide and silver body-originated Ag-110m radioisotope were identified in the postirradiated enriched H2 18 O target. In addition, after passing the 18 F solution through a column containing Quaternary Methyl Acetate (QMA) resin, none of the radionuclidic impurities were any longer observed to any great extent in the sample.

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“…A more recent study 36 has identified that adsorbed hydrogen and deuterium sit at slightly different heights above a Pd(001) surface. In the azimuthal scan (Figure 11), there is a minimum in the yield for scattering of Ne off Pd at 0 (along the [110] azimuth) and at 45 corresponding to the [100] azimuth.…”

Section: Azimuthal Scanmentioning

confidence: 99%