Document jgyoz9Y9rGBgpVyGR7jyoNJoN

7 '7/ ' 7 ' . V.,' ' V .ESTA8US>.#02 ' t ^ .7 :. _ , E-..I. d u Po n t d e Ne mo u r s & Co mp a n y , . : v* iNCORPORATeo", . ._ ' 7 ./>. 7 l-'.,., - Wil min g t o n , De l a w a r e 19898 7/:. Vl/.' 7/ ; EMPLOYEE RELATIONS DEPARTMENT ^ / ; .! . 7 HASKELL LABORATORY ' POR ' " '777. 7 7:71 'V . Vv 7. ' i j; .*. > . ' ... TOXICOLOGY AND INDUSTRIAL MEDICINE / V : bcc WSv. Pell - /N-114.00 . 77"'/'7v " ^D. - R. Diggs N-.7^51 ' . ;:/ .';. D.G., Fowler*-.>., -7.,:: ,7 : \ Dead 'Industries'-Assoc;, f ; January; 1j, Mr. Kurt Raht, Research Engineer ' Research and Development Division 7 The Consolidated Mining and ,v ...... ... , , ... Smelting Company, of Canada, Ltd.- ^ .777.7'.7 7;,.., .`7, 7'7 7 ", 7' Trail, British Columbia, Canada .7 ' Z" .V'.--" ,* 77/.. / 7-7 7;' - ,7.77.; '7/ . bear Mr. Raht: 7.7/ '.:/7 " 7 77: 7_7; 7:7 ;7 7.7 7 7' ' '5-7';Z ' 7/.' 7'/. bon Fowler, has' told me' that, you might be interested in a- . ' : 7 / 7-' 7 77-7co-operative study, of. the health of persons'-exposed to lead. ; Our study is. just getting underlay and has several -parts. , 4 PartT is a study of absences from the plant by production ; .77 '"areas. '.'The, assumption made in this portion, of the. study is. ' -..77 7.,7-' '.that the number of absences will reflect in a rather general - .;7.'7 7.7 ' 7. -./'way the health of the various groups of. workers, bfhen the area 77' 7 :' 7 ' absentee rates are compared, It seems reasonable /to assume that; -7 '7; / '7 if all the rates are similar then,-no significant difference in/-'. 777'7; . sickness rates exists between one area and another. The con- 7. / .! '/ verse of this is, riot necessarily true because absentee rates /-'7' 7y. 7 f . .7 may differ between areas for reasons other than those connected . 7 ;- . - with the health of the employees.; Part I is therefore a crude, . .. ' ; 7 v' screening technique which miglit. Indicate whether the men 7;;77- ; 7 'i ."7 exposed to lead have v the same sickness - rates as other employees.. / 7 ;7 7 7 7 Part II is a more; detailed study and involves recording the ' . ' duration of each man's service for every man on ..the plant and .'z/O-V \ 7'7- * whether or not he has worked in the lead areas. If he has '777.77. : worked in the lead areas then the duration of this potential : 7 7; . 7.7 7 exposure to lead is re corded .7 Next the medical records of all 7 ~ 7 ; 7:. 7 the employees who have worked In the lead areas will be studied '7:..... as well as those of a control group.of men matched for age and7 . . . " length of service. The health records of the. two groups.v/ill ... . 7 ' ' . then be compared. 777.'7 7. '7',"' 7.7' /; i: /v7, //.." 7' ?7;77 7 7 /. - Part III. Since in Parts I and II we are dealing only with , those men now employed, it is valid to assume that if there were . / a health hazard associated with working in the lead areas that those who are now so employed are the employees who are tolerant of' this hazard. It is then a fair question to ask, what happened to those, that left the plant after having been exposed to lead? To answer this question we. are setting up a study 'which will - BETTER THINGS FOR BETTER LIVING ... THROUGH CHEMIST, JA Z ' Mr, Kurt Raht ; . - 2 V,V 'fv January 13/3.965 examine the records of everyone who worked in the lead', area six. years ago and follow them year by year to see what happens: to them compared with a control group'similar in all respects except that , these employees did not work- in the lead areas. We are anxious to enter into a co-operative ~vudy for two. " main reasons, . .- ` 1 1, Our employees are largely exposed to lead alkyls and data are needed on men exposed purely to '. i , ... _ ' inorganic lead, ' ' . .. 2. head has been suggested as causing, or being . ' ' associated with, a multitude of diseases some of ' - which, such as multiple sclerosis, have a low .incidence in'the general population. To prove ' or disprove such an association with lead requires . . \ , , the study of a much larger population than is '- available-to-any one company.' .Therefore a ' - co-operative study Is essential,. - ' If you would be interested in undertaking such a study, I .suggest that a meeting be set up to Include myself and represent ' tatives i'rpm your medical department together with Dr, Sidney Pell, , , ?'./ ' the bio-stacistician.who is associated with me in our study, ; rU' .. -.'V " ? .1!V-. 7 f.,-;.'.'-M J. : ; Sincerely yours, 7 ' ORIGINAL; SIGNED BY . ` G. J. STOPPS ` . , .v- ' ; V : G. J* Stopps, M.B. ,B.S. /v Chief, Physiology Section' " v'7 GJS/dyb 7. 7 ;VV\ '' '' Note:. . Same letter-to Max Johnson^ M.D.The Broken Hill Associated Smelters Pty., Ltd,-, Port Pirie, South Australia, with exception of .last paragraph which'reads: - If you would'be interested in undertaking such a * study, I suggest that you let me know whether the type of- study I have outlined would meet with your approval and,if not,, what you would like to see altered. DUP050 026873