Radiation-shielding material

特許 係属中 Shielding reduces the intensity of radiation depending on the thickness. This is an exponential relationship with gradually diminishing effect as equal slices of shielding material are added. A quantity known as the halving-thicknesses is used to calculate this. For example, a practical shield in a fallout shelter with ten halving-thicknesses of packed dirt, which is 90 cm (3 ft) reduces gamma rays to 1/1024 of their original intensity (1/2 multiplied by itself ten times).