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Q. |
The half value layer of lead for Co-60 is approximately 13 mm (0.5 in). If the radiation level on the source side of a 38 mm (1.5 in) lead plate is 0.64 Gy/h (64 R/h):, the radiation level on the opposite side is: |
A. | 0.08 Gy/h (8 R/h). |
B. | 0.213 Gy/h (21.33 R/h). |
C. | 0.107 Gy/h (10.67R/h). |
D. | 0.32 Gy/h (32 R/h). |
Answer» D. 0.32 Gy/h (32 R/h). |
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Non Destructive Testing and Evaluation