<Tr> <Th> Uses </Th> <Td> Particle detector </Td> </Tr> <Tr> <Th> Inventor </Th> <Td> Hans Geiger Walther Müller </Td> </Tr> <Tr> <Th> Related items </Th> <Td> Geiger--Müller tube </Td> </Tr> <P> A Geiger counter is an instrument used for detecting and measuring ionizing radiation . Also known as a Geiger - Mueller counter (or Geiger - Müller counter), it is widely used in applications such as radiation dosimetry, radiological protection, experimental physics, and the nuclear industry . </P>

What are two important properties of the gas used in the chamber of a geiger counter