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Lucas cell
A Lucas cell is a type of scintillation counter. It is used to acquire a gas sample, filter out the radioactive particulates through a special filter and then count the radioactive decay. The inside of the gas chamber is coated with silver-activated zinc sulfide or ZnS(Ag) that scintillates or shines when struck by alpha particles. A photomultiplier tube at the top of the chamber counts the photons and sends the count to the data logger or counter.
==Radon measurement==
A Lucas cell can be used to measure radon gas concentrations.
Radon itself is an inert gas. Its danger lies in the fact that it is radioactive and its radioactive daughters accumulate in the dust of enclosed areas. The radon daughters may lodge in the lungs and bombard them with alpha and beta radiation.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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