 Franck found a position at the Polytekniske Læreanstalt in Copenhagen for Arthur von Hippel , who was now his son in law , having married his daughter Dagmar . He decided to provide financial security for his children by dividing his Nobel Prize money between them . The gold medal itself was entrusted to Niels Bohr for safekeeping . When Germany invaded Denmark on 9 April 1940 , the Hungarian chemist George de Hevesy dissolved the gold medal , along with that of Max von Laue in aqua regia to prevent the Germans from taking them . He placed the resulting solution on a shelf in his laboratory at the Niels Bohr Institute . After the war , he returned to find the solution undisturbed and precipitated the gold out of the acid . The Nobel Society then recast the Nobel Prize medals . 
