Q. 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: (Solved)
1. 914.5 cm (30 feet)
2. 1524 cm (50 feet)
3. 3048 cm (100feet)
4. 6096 cm (200 feet)
- b. 1524 cm (50 feet)