99m 27. A shielded vial with a 1-mm thick lead shield contains hTe. If A. 11.8 mR/hr B. 23.5 mR/hr the unshielded sample yielded an exposure rate of 188 mR/hr, what will the exposure rate be from the shielded vial? (The lead HVL for Tc is 0.25 mm.) C. 47 mR/hr D. 94 mR/hr
99m 27. A shielded vial with a 1-mm thick lead shield contains hTe. If A. 11.8 mR/hr B. 23.5 mR/hr the unshielded sample yielded an exposure rate of 188 mR/hr, what will the exposure rate be from the shielded vial? (The lead HVL for Tc is 0.25 mm.) C. 47 mR/hr D. 94 mR/hr
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Transcribed Image Text:27. A shielded vial with a 1-mm thick lead shield contains Tc. If
A. 11.8 mR/hr
В. 23.5 mR/hr
C. 47 mR/hr
D. 94 mR/hr
the unshielded sample yielded an exposure rate of 188 mR/hr,
what will the exposure rate be from the shielded vial? (The lead
HVL for Tc is 0.25 mm.)
28. If "Co gives an exposure rate of 38 R/hr at 2 m, at least how
А. 2
В. 3
many HVLS of concrete shielding are required to reduce this
exposure to below 2 R/hr at the same distance? (The concrete
HVL for "Co is 6.2 cm.)
С. 4
D. 5
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