In an isotope dilution experiment, chloride was determined by adding 5.0 mg of sodium chloride…

In an isotope dilution experiment, chloride was determined
by adding 5.0 mg of sodium chloride containing 38Cl (t1/2 5 37.3
min) to a sample. The specific activity of the added NaCl was 3.6  104
cps/mg. What was the total amount of chloride present in the original sample if
400 mg of pure AgCl was isolated and if this material had a counting rate of 38
cps above background 150 min after the addition of the radiotracer?

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