6. Calculate the thickness of lead required to reduce the exposure rate of Cs-137 at a point 4 inches from the source of 12 mR/hr to 0.752 mR/hr. X = (log(11/12) HVL)/(log2)
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Q: 3. A radiation counter is calibrated using a 0.038-µCi carbon-14 standard; a count rate of 4,517 cpm…
A: Using the given data, dpmsource=0.038 μCi2220000 dpm1 μCi=84360 dpm
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Q: What is the exposure rate at 30 cm from a vial containing 20 mCi (740 MBq) of 131I?
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Q: A 192ir (r= 0.462 R. m2/Ci. h) source of strength 20 GBq is present as a wire of length 3 m. What is…
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Q: The maximum permissible workday dose for occupational exposure to radiation is 26 mrem. A 55-kg…
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Q: What is the exposure rate at 30 cm from a vial containing 20 mCi (740 MBq) of 15'1?
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A: Half life of technetium (t1/2) = 4.8 hours Initial activity (Ao) = 35.9 mCi
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