Fig. 2
From: Reducing radiation exposure using commonly available objects
The radiation dose rate was attenuated depending on the thickness of various materials. The materials included newspaper, corrugated cardboard, a magazine, cork, and a board of Betula (birch), all made from wood. The apparent attenuation coefficient for wood was estimated using the equation I = I 0exp(−μt), where I is the intensity of the radiation dose rate with shielding, I 0 is the intensity of the radiation dose rate without shielding, μ is the apparent attenuation coefficient for wood, and t is the material thickness