On 28 July 1941, Schumann arrived in Auschwitz. He worked at Block 30 in the women's hospital, where he set up an x-ray station in 1942. Here men and women were forcibly sterilized by being positioned repeatedly for several minutes between two x-ray machines, the rays aiming at their sexual organs. Most subjects died after great suffering, or were gassed immediately because the radiation burns from which they suffered rendered them unfit for work. Schumann "...chose his test persons himself. They were always young, healthy, good-looking Jewish men, women and girls who looked like old people afterwards. The parts of the body that were treated with the rays experienced severe radiation burns and suppuration (i.e. discharge of pus). Men's testicles and women's ovaries were then surgically removed and sent to Breslau for histopathological examination. Part of Schumann's control tests, to check whether the radiation had worked, was the so-called semen check: a stick covered with a rubber hose was inserted into the rectum of the victim and the glands stimulated until ejaculation occurred so that the ejaculate could be tested for sperm..." Both kinds of samples were sent to the University of Breslau (today Wrocław) for examination.