‘ a att agere ot Bae ‘ te etn wetell2 Meeal Me atone amteste tebee DH i ee ee etm a Me a; TABLE OF CONTENTS Page INTRODUCTION METHODS OF COLLECTION AND MEASUREMENT RESULTS AND DISCUSSION Depth Gradient of Gamma Spectra Old Soil | L2 12 Litter and Guano 14 Young Soil 18 Depth Gradient of sr?° RADIOAUTOGRAPHS Young Soil 21 25 25 Undisturbed 25 Eroded 25 Old Soil 28 Horizontal Movement 28 Buried Organic Layers 30 Roots 30 Pumice 31 CONCLUSIONS 33 SUMMARY 35 REFERENCES 37