TABLE OF CONTENTS
Page
INTRODUCTION
METHODS OF COLLECTION AND MEASUREMENT
RESULTS AND DISCUSSION
Depth Gradient of Gamma Spectra
Old Soil
Litter and Guano
Young Soil
Depth Gradient of sr?°
Young Soil
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
™MY
RADIOAUTOGRAPHS