Page 13 - Curriculum Visions Dynamic Book

The outer metal tube acts as the cathode.
becquerel: a unit of radiation equal to one nuclear disintegration per second.
curie: a unit of radiation. The amount of radiation emitted by 1 g of radium each second. (The curie is equal to 37 billion becquerels.)
ion: an atom, or group of atoms, that has gained or lost one or
more electrons and so developed an electrical charge. Ions behave differently from electrically neutral atoms and molecules. They can move in an electric field, and they can also bind strongly to solvent molecules such as water. Positively charged ions are called cations; negatively charged ions are called anions. Ions carry electrical current through solutions.
 Using a Geiger counter to detect radioactive emissions on contaminated waste land.
Also...
The Geiger counter has been used
to measure the amount of radiation emitted by one gram of radium each second. This value, 37 billion pulses of radiation per second, has been used to define a unit of radiation called the curie. Another unit is the becquerel, one pulse of radiation per second.
Radiation
 This diagram shows the components of a Geiger counter.
The thin metal wire acts as an anode.
The metal tube is filled with neon and bromine gasses at low pressure.
450 V supply, amplifier and counter (which measures the counts per minute)
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