Page 305 - Radiation Safety

PROTECTION AGAINST EXTERNAL HAZARDS

(SHIELDING)

Example of calculation for thickness of shielding

Exposure rate from a radioactive material without shielding

is 1600 µSv.hr -1 and HVL or lead is 3 cm. What is the

exposure rate if the thickness of lead used as shielding is 12

cm?

A 50 µSv.hr -1 I = I .e - 0.693x/HVL
x
o
B 100 µSv.hr -1
I / I = 2 n

C 150 µSv.hr -1 o n

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