At the forest edge (1A), which is the boundary between the forest and the residential area, the points 5 m (1B) and 10 m (1C) distant from the forest edge on the residential-area side were given as the evaluation points of the air-dose rate. Then, at these three points, elevations of 1 m and 4 m from the ground were given: the 1-m height was assumed to be an adult staying outside; the other was a two-story house.