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FE Problem #8 Barrier Thickness #2 An existing concrete wall that is 25 cm thick is to be used to shield a 60Co source so tha

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Gtiven That Aslditional Tícxne leod to Achieve .61. reetuuion 6Oco Source ascm econcrelt 1.0000-0,9960-0,00千0. b From Fia O EFigure D Ks Limtr Fod concartbahon Fiaure a Coball- 60, and Sadium -24 0 .ol 131 Ir 19 Aul 30

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