In the following year de Hevesy met Niels Bohr in Manchester. Bohr's new conceptions about the atomic model led to the separation in 1923 by Coster and de Hevesy of hafnium from zirconium. Hafnium was the last non-radioactive element to be discovered, filling a miss in Mendeleev's periodic law.
Also around 1923 de Hevesy began to use radioactive tracers for the study of chemical reactions. His analysis of the proportions of stable elements in beans paves the way for medical radio-chemistry. The Nobel Prize in chemistry was reserved for him in 1943 for this work before being formally awarded in the following year.
On November 23 in London, Morton and Eden sell as lot 77 four medals received by de Hevesy, including the Nobel Medal dated 1944 and two other rare and prestigious awards : his 1949 Copley Medal attributed by the Royal Society and his 1958 Atoms for Peace medal. This set is estimated £ 120K. Here are the links to the website of the auction house and to the release shared by Artdaily.
De Hevesy spent most of his career at the Niels Bohr Institute in Copenhagen. In 1940 the Germans invaded Denmark and it was then forbidden to own gold in that country. De Hevesy dissolves in aqua regia the Nobel medals of von Laue and Franck that were stored in the Institute. Once peace is restored, he regenerates the gold and sends it to the Nobel Committee which re-strikes the two medals and returns them in 1952 to their original laureates.