16 T omeneH aeERNETo 10% 107 ~ g3 & & % oly 105- § 3 '° ¥y 3 & 8 ge= § . LEE g> § ~ y 3 102+ bj~ ZL8 % x“ @| Qe SE ex Q 1 Fig. 7. i 0.5 NI @ fu iO + I 1.0 MEV Gamma-ray spectra of depth increments of old soil tay from the surface inch. ‘The origin wf each spectrin van been arbitrarily separated from the preceding one byt factor of ten to facilitate insrection of the figure.| t }