:I have used this template when writing articles involving isotopic concentrations.
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The isotopic concentrations of the Martian atmosphere were well known to scientists : They had been measured by the U . S . Viking robot probes that landed on the Red Planet in 1976.
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Despite caesium isotopic concentration in the waters off of Japan being 10 to 1000 times above concentration prior to the accident, radiation risks are below what is generally considered harmful to marine animals and human consumers.
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Thus, two samples of a chemical element which is naturally found as being composed of more than one isotope, collected from two substantially different sources, are expected to give slightly different relative atomic masses ( atomic weights ), because isotopic concentrations typically vary slightly due to the history ( origin ) of the source.
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