= ar nay semple of a cubic meter of air a minute be= ceuse this was necessary of very low concen= trations of beryllium which were of interest but the type of evaluation that we do requires that we get very cloce to the operator to see how much is in the air that he may be breathing, Can I have the next slide, pleare? This 1s the type of sheet we draw on each operator in a plant. It is made up of several individual.operationa that the man Goea at which we take samples in his breathing zone as I showed you in the previous slide, plus several locations where he ia apt to epend enhour to two and a half hours to three hours a day just walking sround pushing buttons and generally managing things, These sere all weighted against the time and the final average figure is computed in the number of times of permissible level that the man is exposed to. These data are used to correlate with yearein data and with possible iliness deta in the future, The next thing that I think might 59