13 3 |O'(e5144_p, 144! T Ey!S5 —— Sb l25 2 10+ Cs| 137 spies 125 oe | | Co60 | w ! ~~ 5 & s @ C960 77e> | | lOr a c = oO OL 0-1 SL “ < 9-10 10=| Fig. 5. l O05 iT 1-2" I MEV |.O l 1.5 Gamma-ray spectra of equal amounts of old soil from different depths.