A teacher measured the count-rate from a sample of lanthanum-140 using a Geiger-Muller (G-M) tube.Explain why the count rate was less


A teacher measured the count-rate from a sample of lanthanum-140 using a
Geiger-Muller (G-M) tube.Explain why the count rate was less than the activity of the sample of lanthanum-140​


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