Radioactive isotopes in dating the past
For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.For a single element, these atoms are called isotopes.Because isotopes differ in mass, their relative abundance can be determined if the masses are separated in a mass spectrometer (see below Use of mass spectrometers).The situation is analogous to the death rate among human populations insured by an insurance company.
Even though it is impossible to predict when a given policyholder will die, the company can count on paying off a certain number of beneficiaries every month.
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