Fig.1-33 (a) Overview of the behavior of <sup>137</sup>Cs in urban areas and (b) decreasing trend of air dose rate estimated considering the behavior of <sup>137</sup>Cs

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Fig.1-33 (a) Overview of the behavior of ¹³⁷Cs in urban areas and (b) decreasing trend of air dose rate estimated considering the behavior of ¹³⁷Cs

Urban areas mainly have soil surfaces and other artificial surfaces such as paved surfaces and houses. The behavior of ¹³⁷Cs, such as downward penetration and horizontal wash-off due to rainfall, differs between soil and paved surfaces, thereby affecting the decreasing trend of air dose rates.

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