100 METERS a } an ~ .” a ome F~ me > ee =“ oe ry * + ~ * . a Ma 50 ” ~~ S ‘ ~™™~ . a uot , ~~ ¢ . ms 140 ; \ ' ' » on “ os aa “S 12 7 ~ 20 . . * n ~ . yO ° * mo ~”™ « 2~ * > . a ~ + 8 ~ns oat > ~ ~ * — s Fig. B.4.1.d. The gamma background exposure rate (UuR/hr) at 1 m above the ground, measured with a portable Nal scintillation counter.