Question: 3. Technetium- 99m (e.rre Te ) is routinely used in nuclear medicine scans in hospitals. A 0.850Ci sample of 99m Tc gave 155,000 counts in

3. Technetium- 99m (e.rre Te ) is routinely used in nuclear medicine scans in hospitals. A 0.850Ci sample of 99m Tc gave 155,000 counts in 20.0 seconds. What is the efficiency (c, in percent) of the detector for the 140.5keV gamma of M-Tc if the branching ratio (abundance) of this gamma is 89.0%

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