In 1913 he invented a counter for detecting atomic particles
The proof of the identity of the  particle with the helium atom is incomplete 
until it ... Observations to detect helium in the tube T were made at intervals, in the 
.... Spectra of the Elements," Philosophical Magazine 26, 1024-1034 (1913) and... [DOC] [TLE] The Geiger-Mller Counter of 1928 - Taylor & Francis Online [PAR] Ancillary to the emergence of nuclear physics in the 1930s, this important ... 1913
, or what role Walter Mfiller played in the invention of the Geiger-Mfiller .... 
counting rate was higher than expected and beyond any he had observed with 
..... for Geiger was detecting alpha particles with a point counter that was 
specially.