Page 406 - Emergency Response Book

Example Calculation 1 16

The dose rate at 2 meter from an X-ray machine is 400 Sv/hr.

At what distance will it give a dose rate of 25 Sv/hr?

Solution

Inverse square law: X d = X d 2
2
2 2
1 1

Given: X 1 = 400 Sv/hr

d 1 = 2 meter

X 2 = 25 Sv/hr

Therefore

400 x (2 ) = 25 x d 2 2
2

d 2 2 = (400 x 4) / 25

= 64

d 2 = 8 meter

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