1. Müller was born in Hannover on 6 September 1905, as one of several sons of an educator, Heinrich Müller, and Anna née Sohl. He completed his Abitur at Koblenz and from 1923 studied at the University of Kiel. His experimental work from 1926 to 1929 led to the development of the Geiger-Müller counter. Müller worked at Siemens from 1929 to 1939 and remained in Germany throughout the post-war period until 1951 when he left for Australia. He moved to California in 1958, and is listed inAmerican Men of Science1966 3784 3784 supplement 5 (1969), p. 485; and supplement 6 (1970), p. 501. From 1941 he was ordered to use the name Walter to conform with his birth certificate, whereas Walther had appeared on his baptismal certificate; a discrepancy detected and acted upon by the military officials. Müller died in California, 4 December 1979.
2. Geiger . 1882–1945.Dictionary of Scientific BiographyVol. v, 330–333. 1972 is listed in the He was assistant in Manchester 1906–12, director of the radium laboratory in Berlin 1913–24, professor of physics at Kiel 1925–29, at Tübingen 1929–36, and at Berlin 1936–44. During the last fifteen years of his life, Geiger was preoccupied with research on cosmic rays. See Peter Brix, ‘Hans Geiger: Ein Wegbereiter der Modernen Naturwissenschaft’,Heidelberger Jahrbücher, 27 (1983), 101–15; and Otto Haxel, ‘Erinnerungen an Hans Geiger, den Vater der Zählmethoden’,Physikalische Blätter, 38 (1982), 296–7.
3. Elektronenz�hlrohr zur Messung schw�chster Aktivit�ten
4. Geiger-Mueller counters