The success of this method depends upon how well directions are followed partic— It ularly insofar as spindle oil is reapplied after each washing of the hands. has been our experience that it is usually possible to reduce the hand counts to a few hundred or less by means of this method. D. A 10 percent solution of the detergent "aerosol" is used Gloves and Respirators: for decontamination of rubber articles. Other detergents do not seem to work as The solution containing acetic acid formerly used by us has been discontinued well. because the acid tended to injure the rubber and was hard on the skin if not properly The gloves are washed every day (after one wearing). They are rubbed and removed. swished around in the solution until clean. This is quite time consuming as about two minutes is required for each glove (we hope to cut this down by getting each person to decontaminate his own gloves after wearing). The rubber respirator face- pieces are cleaned once a week if their count is over 50. Stone, rocedures E. Glassware: This is cleaned by running each piece of glassware through the following solutions: water l. Ivory soap water followed by rinsing 2. 3. cleaning solution followed by rinsing 4. Ivory soap and water followed by rinsing distilled water 5. Popham says that the results seem to be satisfactory but he will not guarantee them. Not very much work has been done on this problen. F, Tools: Can be decontaminated with an oiled rag as described above. and clean frequently, 1eir , it "here “esent j In Use clean cloths Masks: We have used only Wilson respirators and positive pressure masks. Most of the respirators put out by this company have filter pads which are satisfactory for this type of dust. Their chief disadvantage is in their failure to fit properly but we have found that one of the following three types will fit just about any type of face: 200L, 5L and 750. We are careful to fit each mask to the person before letting them go into use. As far as the positive pressure masks are concerned we have not tried the A.M.S. type because they did not appear as satisfactory as the Wilson type as described in their catalogues. We have modified the masks by putting on softer tubing onto the facepiece since there were some complaints about the stiff tubing supplied by the company and by placing the filters on the wall rather than on the belts, The tubes are fastened to the belts to avoid the masks being jerked off the faces of the men if the tubing gets caught. We have still not been able to put the positive pressure masks in genera] usage because of the crowded conditions in our laboratories. en 5 The Eastman masks which I described to you over the telephone appear to be the most satisfactory of all, but have not been well tested. If you see them and consider having some made up we would be very interested in placing an order at the same time." wa le wv Declassified by L. M. Redman (September 11, 1972) 23