This volume is the result of the concerted effeort of a number os scientists to summarize in a succinct way the current understanding of the mechanisms of these localizations. The editors of the book gratefully acknowledge this combined effort.

This series of books on Radiotracers in Biology and Medicine is on the one hand an unbelievably expansive enterprise and on the other hand, a most noble one as well. Tools to probe biology have developed at an accelerating rate. Hevesy pioneered the application of radioisotopes to the study of chemical processes, and since that time radioisotopic methodology has probably contributed as much as any other methodology to the analysis of the fine structure of biologic systems. Radioisotopic methodologies represent powerful tools for the determination of virtually any process of biologic interest. It should not be surprising, therefore, that any effort to encompass all aspects of radiotracer methodology is both desirable in the extreme and doomed to at least some degree of inherent failure. The current series is assuredly a success relative to the breadth of topics which range from in depth treatise of fundamental science or abstract concepts to detailed and specific applications, such as those medicine or even to the extreme of the methodology for sacrifice of anaimals as part of a radiotracer distribution study.

First multi-year cumulation covers six years: 1965-70.

The editors have asked me to write this foreword probably for two reasons: First, I have spent 35 years trying to develop radiolabeled compounds that would help diagnose and treat disease. I, and the people from my laboratory, have been much involved with developing Nan'I for the diagnosis and treatment of hyperthyroidism and well-differentiated thyroid cancer. Second, I was a participant throughout the entire symposium upon which this book is based. Our latest '311-labeled compound, [l3lll metaiodobenzylguanidine, took us 13 years to develop. It has succeeded in diagnosing and treating adrenergic tumors '31 under circumstances where Na 1 would have failed for the diagnosis and treatment of thyroid cancer. I therefore hope that more scientists will be attracted to this field. This book is written by intelligent, experienced investigators who are knowl edgeable. It is a must for anyone new in the field. For the experienced, I would like to remind you that I attended the entire symposium; the breadth and timeliness of the update has helped us to redirect some of our current efforts into more scientifically productive channels. William H. Beierwaltes, M.D.

This timely resource compares single-photon emission tomography (SPECT), used mainly withTechnetium and iodine for routine clinical examinations, and positron emission tomography(PET) , employing short-lived radionuclides of carbon, oxygen, nitrogen, and fluorine in researchinvestigations.Presenting the logic behind why one approach is better than another in various circumstances,Radio pharmaceuticals details the use of radiolabelled substrates in measuring the effect of diseaseand drugs on regional metabolism and receptor concentration/occupancy .. . discusses factorsaffecting the selective retention of small metal complexes by various tissues .. . analyzes the interactionof small exogenous metal complexes with enzymes in vivo and the critical role of stereochemistry. . . explores the use of radio labelled compounds in the study of neuroactive compounds,neurotransmitters, enzyme inhibitors, and substrates in vivo .. . covers the design and pharmacologyof radiolabelled drugs as probes of site of action , selectivity and specificity, and pharmacokineticsin vivo .. . and more.Extensively referenced with over l 050 bibliographic citations, Radiopharmaceuticals is a state-ofthe-art guide for pharmacists; organic, medicinal , and radiopharmaceutical chemists; pharmacokineticists;nuclear medicine physicians and technologists; neurochemists; and governmentregulatory personnel .

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