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Tungsten has a linear attenuation coefficient of 30.5/cm for gamma rays with 150 keV of
energy. If an unshielded Tc-99m syringe has a radiation exposure rate (I(0)) of 34 mR/hr, what
will be the exposure rate if a 0.25-cm tungsten shield is placed around it?
Using the calculation above, how much (what percent) is transmitted through the shield? What
percent is attenuated?

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