81 TABLE N.7 #4 PLUTONIUM-239: It over is FRACTION OF ORAL DAILY INTAKE EXCRETED IN URINE ~i~i assumed that the daily the period specified. 1 3.62 X 10-5 5 6.2 x 10-5 10 8.61 x 10-5 20 1.31 x 29 1.67 X table’s data Laboratory. is constant = .001. ?fOss (new) Jones (old) Elapsed interval (years) ~1 The National intake FI were supplied I have used 5.42 X 10-5 1.71 x 10-4 10-4 2.3 x 10-4 10-4 2.92 X 10-4 .- by Dr. E. T. Lessard of the Brookhaven the Moss factors (Moss, 1988). bl The intake can be calculated by dividing factors given. For example, after 20 years excretion is found to be 3 x 10-5 picocuries. (3 x 10-8)/ 2.3 x 10-4 = .13 picocuries/day. the urinary excretion of intake, the daily Then the intake is: by the