A. Bronselaer

Adsorption of volatile polonium and bismuth species on metals in various gas atmospheres: Part I - Adsorption of volatile polonium and bismuth on gold

E. A. Maugeri, J. Neuhausen, R. Eichler, R. Dressler, K. Rijpstra, S. Cottenier, D. Piguet, A. Vogele, D. Schumann, A. Bronselaer
RADIOCHIMICA ACTA
104 (11), 757-767
2017
A1

Abstract 

Polonium isotopes are considered the most hazardous radionuclides produced during the operation of accelerator driven systems (ADS) when lead-bismuth eutectic (LBE) is used as the reactor coolant and as the spallation target material. In this work the use of gold surfaces for capturing polonium from the cover gas of the ADS reactor was studied by thermochromatography. The results show that gaseous monoatomic polonium, formed in dry hydrogen, is adsorbed on gold at 1058 K. Its adsorption enthalpy was calculated as -250 +/- 7 kJ mol(-1), using a Monte Carlo simulation code. Highly volatile polonium species that were observed in similar experiments in fused silica columns in the presence of moisture in both inert and reducing gas were not detected in the experiments studying adsorption on gold surfaces. PoO2 is formed in both dry and moist oxygen, and its interaction with gold is characterized by transport reactions. The interaction of bismuth, present in large amounts in the atmosphere of the ADS, with gold was also evaluated. It was found that bismuth has a higher affinity for gold, compared to polonium, in an inert, reducing, and oxidizing atmosphere. This fact must be considered when using gold as a material for filtering polonium in the cover gas of ADS.

Structural basis of the proinflammatory signaling complex mediated by TSLP

K. Verstraete, L. van Schie, L. Vyncke, Y. Bloch, J. Tavernier, E. Pauwels, F. Peelman, S.N. Savvides, A. Bronselaer
Nature Structural & Molecular Biology
21 (2014), 375–382
2014
A1

Abstract 

Thymic stromal lymphopoietin (TSLP) is a cytokine critical for the development of chronic inflammatory disorders including asthma and atopic dermatitis. The structure of the ternary complex formed by TSLP and its coreceptors TSLPR and the interleukin-7 receptor reveal how TSLP is able to organize receptor-receptor contacts to facilitate intracellular signaling.

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