Question $17(5$ points$)$

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You are outside of building, the building is constructed of $12$ inch concrete walls. Your equipment reads $75$mre$\frac{m}{h}r$ just outside of the lavilding. What would the reading be just inside the wall of the building?

$($concrete has a half thickness of $6$ inches$)$

$75$mre$\frac{m}{h}r$

$150$mre$\frac{m}{h}r$

$225$mre$\frac{m}{h}r$

$300$mre$\frac{m}{h}r$