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3. A radiation worker stands 50 cm away from a radioactive source of 25 mCi 57Co. Calculate the exposure value
received by the worker while standing for 2 hr near the source. The isotop half-life is 271.8 days.

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A radiation worker stands 10 cm away from a radioactive source of 55 mCi 57Co. Calculate the exposure value received by the worker while standing for 2 hr near the source. The isotope half-life is 271.8 days.
(a) At an initial time, a radioactive sample has an activity of 8.77x104 Bq. After 3.88 hours the activity is 5.35x104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.88 hours? (A) (in s) OA: 6.426x103 OB: 9.317x103 oC: 1.351x104 OD: 1.959x104 OE: 2.840x104 OF: 4.119x104 OG: 5.972x104 (B) (in Bq) H: 8.660x104 OA: 1.387x104 OB: 1.845x104 OC: 2.454x104 OD: 3.264x104 OE: 4.341x104 OF: 5.773x104 OG: 7.678x104 OH: 1.021x105
(a) At an initial time, a radioactive sample has an activity of 8.52x104 Bq. After 3.85 hours the activity is 5.42×104 Bq. (A) What is the half-life of the isotope? (B) What is the activity after an additional 3.85 hours? (A) (in s) OA: 2.285x103 (B) (in Bq) OA: 1.149x104 OB: 3.314x103 OB: 1.344x104 OC: 4.805x103 OC: 1.573x104 OD: 6.967x103 OD: 1.840x104 OE: 1.010x104 OE: 2.153x104 OF: 1.465x104 OG: 2.124x104 OF: OG: 2.519x104 2.947x104 OH: 3.080x104 OH: 3.448x104
43. A patient received a full-body electron dose of 240 mGy, a neutron dose (1 A. 1.8 Sv B. 1.1 mSv MeV) of 43 rad, and an alpha particle dose of 0.30 Gy. What was the effective dose to this patient's stomach? C. 0.85 Sv D. 130 mSv 44. A nuclear power plant accident exposes a population of 24,000 people to an average effective dose of 9.2 mSv. What is the collective effective dose? A. 0.38 person-Sv B. 0.38 man-rem C. 220 person-Sv D. 220 man-rem 45. A 1-g vial of "Po has an activity of 166 TBq. What is this in traditional A. 4,500 Ci B. 4.5 Ci C. 6.1x102 Ci D. 6.1x 10" Ci units?