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                                 Abstract:The present paper pionted out that in the measurement of the number of atomsof a radioactive isotope in a sample at time t0, the error introduced through the in-accuracy of its decay constant (λ) can be reduced to a much smaller value by thecareful selection of the time of measurement or measurements of its radioactivity ataround one life time (1/λ) after t0 and doing the calculation.
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