t TABLE OF CONTENTS {4 LIST O TABLES . ACKNOWLEDGMENTS 2. ee es ee seve v vers v eevee ve seers sree . 2 we we we ee eevee eee eee ee ew eee re ° e * * ? e e ? 6 * ° CHAPTER @-: I JI TIL) INTROOUCT ION s ° . ° s s Effects Environmental 8 e e ° t * . 2. we ee oe ee eer er evens OEVELOPMENTS IN RADIOBIOLOGICAL RESEAR@H , «1. es we eos * ® * e ° . ° ® e * ° e * ° ? ¢ e ° ° * e . s ¢ s e » e e e e e * e e e e ° . * e ° e ? e Radioactivity * ° e s e e . s ° ? . ? ° ° . e s Risk Assessment Vv Ld A HISTORICAL PERSPECTIVE Health TV ? . «RADIONUCLIDES OF SIGNIFICANCE . 2 1 ew ew ee we we we ewe we ew RADIOIODINE ° e ® e > ° * e ee Summa ry * . * e s * ? e ° ° ff of ff ° e ° ° ? e * e ? ? ® ty ? . e . ° ? ° , ° tJ . > ° ? Environmental Pathways . 6. +e te ee we ew ew ee eee Metabolic Pathways ... . o ew or ee reese Radiobfological Effects . 2... ee eee see ee ee Thyroid Neoplasia... 2s eee ee we a a re Differences in Radiobiologic Effectiveness .. 2. e+ ee eae Estimates of Thyrotd Risk . 1... + eee ee ew eh ee es Means of Protection... . a VI RADIOSTRONTIUM Surama ry ° e 5 ww ee te te co me wer we te ° . . * * 8 Environmental Pathways Metabolic Pathways 98 8 & # # . 6.55 5 * s * e e . e * e * ° * * ee we ee te es see 6... ep wwe ew we eh ee es vo ees Radiobfological Effects ......e- ot ee ee - VIE -RADTOCESIUM Dw ee Summary . Pr rn soe ee ye ee ee Enviromental Pattways 6 0. eee et ee te ee Metabolic Pathways 6. ee ee eh ee ee ee ee ee Padioblolagte Effects. 2... 1 eee poet eee ee i , 19 19 19 22 24 25 27 31