Document wvzXzKYxe5o1jKOZvVw8e3nD

Ms: tint. fe j\f :n V? ? *?;/ I i '.'. Wi ;. 836 Annals Now York Arnriemy of Snonce* i-ths m he *, i ; ' i\ fM review the work that we have undertaken. The asbestos textile mill in moisture in the ft Hog&nsvilie has been producing textile products since 1941. In 1941, using tonveying system the Midget lropinger, dust counts were begun *t many stations, many time* has been eliminst a week and have continued to be obtained for some 23 years. During this were used and si time two people have done all the dust counting. The person who is now going to the paI* doing it was trained by the person who used to do it. I should say wt do was installed, it not know what we are counting. We are counting everything we get in the chamber, but we are counting in the same manner. When this program started we hoped to get some meaningful results. In order to do that, we averaged out the number of counts that were ob tained at each station during the year in terms of million of particles per . , Mbi^fMt and^mulUpUed .ttMm^^^fteJyMi^'in abjdoip^^^S^visd.%t^r [ figure which wt celled million particles per'cu/ft. years, and we did this" with each worker, many of whom we have been able to follow. - We constructed s scattergram lh which we placed on the ordinate th* years of exposure, and on the abscissa the million particles per cu ft. yean. Using this as a baseline (for whatever meaningfullneaa it had), when wt got to a period of some SO to 60 million particles per cu ft. years, we began to And people with pulmonary asbestoeis. As the million particle per cu. ft. years mounted, we began getting more patients with pulmonary asbestos!*. In terms of what has been considered a safe dust count in the area, wt started out with a theory -- because everybody said it.was so--that & ... million particles peircublc foot was a aafe figure. Our bwiTbdnciasion. t \ Ve began seeing what was happening In our own process, was that the only safe amount of asbestos dust exposure was tero and that the efforts in terms of achieving that lay basically in engineering, and, secondly, in edu-'. vLW/V,: ` I '. cation. But as far as a safe" level of asbestos dust is concerned, our own conclusion in Hogansviile, Ga.. is that there is no safe level. The.safe level __ -------------- ------ ------ "to say that the standards whichwe mentioned, four fibers per mill illter or million -p-a--r-t.ic"lejs'irp<ejgr',-cault.h"oftu-gahre1'shiompeplyI dsitdandaI rds ^'not use the word "aafe." These sre standards which are actually used, al though'they are not ever expressed as being safe standards. A.further standard has been .mentioned of fcO'to 60million particles per cu ftcyean. ^S^^^'supposeHhU Is the equivalent bf some 2 million particle* per cu ft. eon- v i-T"'-- centratlon. This would be another standard which might be nsedlbut II l .ii!' \ ^.. necessarily a'perfectlysafc level of dust. 1* SILVERMAN (Harvard V., Hottint, Mn*t.>: 1 have hart some experience 'f in specific uses of ashestos; In particular the asbestos tile Industrywhieh Is a^mijnr eonsjumer of Asbcslna flliorl'With Just nfew simple application* of " rontml such u* switching fnmv jule bugs which wvm shaken mu hy (l* s i/. . . Wiirksr to he shlppari Iwn-k In the plant to )>*)*'r Img* which Ivlslii Uf* ..... r" f;- Wnr ^oouasjgQj PRODUCED BY FORr>