Definition
Hans Geiger was a German physicist renowned for his invention of the Geiger counter, an instrument used to detect and measure ionizing radiation. The Geiger counter, later improved with Walther Müller, became an indispensable tool in nuclear physics and related fields. Geiger's work significantly advanced our understanding of radioactivity and nuclear processes. His contributions have had a lasting impact on science and technology. He paved the way for numerous discoveries in nuclear physics.