' ' 2 10 ° + ye 4 é 11 5 enattre ee oe ~~ \ . TT BR —. - 2 q ~ . : rT » oe ; } : “~ . an “A . “ =| 7 OM with Fig. B.11,1.d. The gamma background exposure rate (uR/hr) at 1 m above the ground, measured a portable Nal scintillation counter. yr im 8 gh§ wad 4 a als