ASNT Level III Study Guide - Industrial Radiography Radiation Safety Questions
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A cobalt source of 73 Ci is exposed for a full 60 min. Assume a 14.0 R/Ci/h factor, shooting through a 3 half-value collimator. What would the restricted area be on the cold or collimated side of the collimator?a. 149 ft (45.42 m)b. 162 ft (49.38 m)c. 211 ft (64.31 m)d. 253 ft (77.44m)
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