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- A chemical element, symbol Cs, atomic number
- 55, relative atomic mass 132.91. It is used
- in the manufacture of photoelectric cells. A
- highly radioactive isotope, caesium 137
- (half-life 30 years) is a waste product from
- nuclear power stations and is used for mass
- radiation and sterilization of foodstuffs,
- medically for irradiation of surface tumours,
- and as the basis of atomic clocks.
-