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    Half-Value
Layer (cm)		 Tenth-Value Layer (cm)
Radioisotope Gamma (MeV) Concrete Steel Lead Concrete Steel Lead
Cesium-137 0.66 4.8 1.6 0.7 15.7 5.3 2.1
Cobalt-60 1.17,
1.33		 6.6 2.1 1.2 20.8 6.9 4.0