Holmium [SEP] discoverer or inventor
efficiencies of gamma ray spectrometers.
History.
Holmium ("Holmia", Latin name for Stockholm) was discovered by Jacques-Louis Soret and Marc Delafontaine in 1878 who noticed the aberrant spectrographic absorption bands of the then-unknown element (they called it "Element X"). The following year, Per Teodor Cleve independently discovered the element while he was working on erbia earth (erbium oxide).
Using the method developed by Carl Gustaf Mosander, Cleve first removed all of the known contaminants from erbia.
maternal grandfather was Per Teodor Cleve, Professor of Chemistry at the Uppsala University, and the discoverer of the chemical elements thulium and holmium. His great-great-great-great grandfather was Leonhard Euler.
Enjoying such a privileged family environment in science, education and research, it is not surprising that young Ulf would become a scientist, too, so he went to study medicine at the Karolinska Institute in 1922. At Karolinska, he worked under Robin Fåhraeus in blood sedimentation and rheology and did research work on the pathophysiology