There's always some background radiation. There's ionizing radiation around -- trace amounts of radioactive substances decaying, cosmic rays penetrating the atmosphere, etc.
background radiation
Geiger counter was invented by the Hans Geiger in 1908.
A device generically called a Radiac, however there are dozens of different kinds of Radiacs which operate by different principles and measure different things. Some are:geiger-mueller counterrate meterionization chamber meterscintillation counterelectrometer dosimeterionization chamber dosimeterphotographic film dosimeter
The Geiger counter clicked as it checked for radiation.
The Geiger counter that measures radiation.
According to the Britannica Concise Encyclopedia, the Geiger counter was invented by Hans Geiger. For more information, see the Related Link.
background radiation
Geiger counter was invented by the Hans Geiger in 1908.
Geiger counter was created in 1908.
The Geiger Counter was developed by Hans Geiger.
A device generically called a Radiac, however there are dozens of different kinds of Radiacs which operate by different principles and measure different things. Some are:geiger-mueller counterrate meterionization chamber meterscintillation counterelectrometer dosimeterionization chamber dosimeterphotographic film dosimeter
it is used for quenching of the geiger-counter
The Geiger counter clicked as it checked for radiation.
what is the principle of geiger muller counter
the geiger counter
created the geiger counter
The Geiger counter that measures radiation.
Levels of radioactivity are measured by a Geiger counter. Hans Geiger and Walter Muller created a practical radiation counter in 1928.