Radiation therapy departments use Cs-137 isotope for cancer treatment.  The room walls have concrete to shield the radiation.  The half value layer for Cs-137 radiation is 4.8 cm concrete.  The concrete wall to reduce the gamma rays to 0.5% of original intensity is _____ cm thick.

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Radiation therapy departments use Cs-137 isotope for cancer treatment.  The room walls have concrete to shield the radiation.  The half value layer for Cs-137 radiation is 4.8 cm concrete.  The concrete wall to reduce the gamma rays to 0.5% of original intensity is _____ cm thick.

 
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