“…Thorium nitrate tetrahydrate, Th(NO 3 ) 4 ,4H 2 O, (99.8%) was obtained from Lachema (CZ) and used in a hydrated form as received. Thorium acetylacetonate, Th(acac) 4 , was prepared according to the literature [39]. Polyvinyl alcohol (PVA, Mowiol 18e88) and Polyvinylpyrrolidone (PVP, M w ¼ 360 kDa) were obtained from Merck and used as received.…”