The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 c – McqOptions

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1.	The radiation from 37 GBq (1 Ci) of Co-60 (0.145 Gy or 14.5R at 30.5 cm or 1 foot) is attenuated in air to approximately 5mR/h at a distance of approximately:
A.	914.5 cm (30 feet)
B.	1524 cm (50 feet)
C.	3048 cm (100feet)
D.	6096 cm (200 feet)
Answer» C. 3048 cm (100feet)

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