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6. A radiation detection system has a mean background counting rate of 2 counts per second. A 30 min counting for an unknown radioactive sample led to the gross counts of 4,000 counts (a) Compute the net count and its uncertainty. (b) Find the minimum counting time required to reach 5% uncertainty for the net counts.

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Net caunts tounting hate x time 三3600 -11-36 Db)x100% 40 DD [4000-56001x1007- 4000 -一101。 0-05 40D0 Net launt 3800 Foz 3800 Counts 4 x 380D

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