15 3x10 T—_ T l 10° - 137 Cs SPIKE a 10° - 3 S = @3 2 S 10+ SbSPIKE 4 SOIL : S > rer Fig. 6. l 0.5 ! 1.0 MEV L 15 Gamma-ray spectrum of a 9 to 10-inch-depth increment from old soil compared with the gamma spectra of Sb?25 and csl37, woe at Oo . Me 10! 9-10" . 1 etcrr teh t i ‘ A i 4 a wR .