TABLE OF CONTENTS (Cont 'd) Page Figure Integral exposure rate spectra for the Matural eEMitteErsS.... ccc ew ew ewe cern err e nc enaes 38 Figure Differential angular exposure rate distributions of scattered and unscattered y-rays for uniformly distributed sources..... pect e ees 39 Figure Differential angular exposure rate distributions of unscattered y-rays for uniformly distributed SOUrCES....... cc cc eee eee eee ere eens 40 Figure Differential angular exposure rate distri- bution for the natural emitters........ sce ees 41 Figure Total exposure rates as a function of height for exponentially distributed sources........ »-42 Figure Total exposure rates as a function of height Figure 10. for plane SOULCES... cc ee ee ee te ee ee eee 43 Total and scattered exposure rates as a function of height for various exponentially distributed SOurceS........ eee eee ee ee eens 44 Figure ll. Total exposure rates as a function of energy for various exponentially distributed sources..45 Figure 12. Effect of source depth distribution on total exposure rates at various heights relative to the total exposure rates at 1 meter......... 46 Figure 13. The ratio of the exposure rate due to scattered y-rays to the total exposure rate as a function of source energy for various depth distributions... .... ccc eee cee ew eee eens 47 Vil