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- W1993041842 abstract "The southern portal of the St. Marko church in Zagreb, Croatia, is currently under the process of conservation. The conservation treatments on calcareous sandstone consist of (i) removal of harmful sulfates (gypsum) from the surface of the material by saturated solution of ammonium carbonate; and (ii) treatment of the material surface with a 10% solution of barium hydroxide in order to convert the remaining dissolvable sulfates into non-dissolvable compounds and to strengthen the material surface. The nuclear microprobe has been used to measure the level of gypsum induced damage, and quality of conservation. More specifically, the surface quantity and depth concentration profiles of sulfur have been determined in several samples taken from the portal before and after the treatment with the solution of ammonium carbonate. To test the quality of treatment by the barium hydroxide solution, the depth concentration of barium in the samples has been determined after the treatment. Both sulfur and barium concentration levels have been determined by scanning the focused proton beam over the samples, detecting PIXE spectra and creating elemental distribution maps. Beside portal samples, the efficiency of the barium hydroxide treatment was tested on sandstone samples from nearby stone pit assumed to be the origin of material used for portal construction." @default.
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- W1993041842 date "2005-04-01" @default.
- W1993041842 modified "2023-10-18" @default.
- W1993041842 title "The use of the RBI nuclear microprobe in conservation process studies of a church portal" @default.
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- W1993041842 doi "https://doi.org/10.1016/j.nimb.2005.01.115" @default.
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