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9. A lead pig containing a source of Ir-192 with 2 cm wall thickness is inside a 30 cm diameter plastic shipping drum (plastic density

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9. A lead pig containing a source of Ir-192 with 2 cm wall thickness is inside a 30 cm diameter plastic shipping drum (plastic density = 1.2 gcm'). The exposure rate constant of Ir-192 is 4.69 Rom/mCihr. Calculate the max activity to keep exposure rate below 50 mR/hr on the drum surface. A. 100 B. 11 C. 20 D. 5 E

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