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<br />'I <br /> <br /> <br />/. <br />, <br />( <br /> <br />t <br />Ii' <br />F\ <br /> <br />7535 <br /> <br />September, 1970 <br /> <br />IR3 <br /> <br />J oumal of the <br /> <br />IRRIGATION AND DRAINAGE DIVISION <br /> <br />Proceedings of the American Society of Civil Engineers <br /> <br />SILVER IODIDE GENERATORS AND PUBLIC HEALTHa <br /> <br />By William J. Douglasl <br /> <br />INTRODUCTION <br /> <br />t, <br />! <br />l <br /> <br />Questions have occasionally arisen about the possible deleterious effects <br />of the materials released from a silver iodide generator. Do these effect in- <br />dividuals in the immediate vicinity and can these materials result in air or <br />water pollution? The words "poison" and "poisonous" have sometimes been <br />included in such questions. <br />Analysis of these effects inescapably involves careful consideration of <br />dosage (10). Many materials in common use, such as foodstuffs, beverages or <br />nonprescription medicines become poisonous when the dosage exceeds safe <br />limits. For example, ethyl alcohol is widely used in beverages, and if con- <br />sumed in sufficient quantity can produce fatalities. Caffeine in doses over 1 <br />g will produce definite symptoms (palpitation, excitement, dizziness, head- <br />ache, and vomiting) and in larger amounts would undoubtedly pr,oduce more <br />severe reactions. Neither ethyl alcohol nor caffeine is generally considered <br />to be poisonous. Numerous other widely-used materials such as aspirin and <br />nicotine COUld also be cited. <br />Threshold limits (formerly maximum allowable concentration) have been <br />established for materials which are in common industrial use or which are <br />common byproducts of industrial processes. In the United States, threshold <br />limits set by the American Conference of Governmental Industrial Hygienists <br />(ACGIH) have rec-elved WIde acceptance. Tnese \'.illliesrep'r-eseii"n!"lmaffiOilS <br />under which' it is believed that nearly all workers may be repeatedly exposed, <br />Note.-Dis,cussion open until February 1. 1971. To extend the closing date one <br />month, a written request must be filed with the Executive Director, ASCE. This paper <br />is part of the. copyrighted Journal of the Irrigation and Drainage Division, Proceedings <br />of the American Society of Civil Engineers, Vol. 96, No. IR3, September, 1970. Manu- <br />script was submitted for review for possible publication on December 12, 1969. <br />a Presented at the October 13-17, 1969, ASCE Annual and Environmental Engineer- <br />ing Meeting, held at Chicago, m. <br />IRes. Meteorologist, Office of Atmospheric Water Resources, Bur. of Reclamation, <br />U.S. Dept. of ~he Interior, Denver, Colorado. <br /> <br />273 <br /> <br />, <br /> <br />."",.,,~l <br />c1.e(:.'.>";.'~~ it,;,-' , Joe -/;.;;~ <br />