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.

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?