a 1/2 inch Zz 5 inches ro = 3/8 tnch b= (6 - 2/1) inches where 1/u is the mean-free-path of gamma radiation in lead. K was evaluated by means of numerical integration for values of E (and corresponding values of b) at 200-kev intervals between O and 2 Mev and at | 3 Mev (Fig. 8). The absolute photon intensity is a combination of these various correction factors, i.e.: I = AC/vwk A graph of I/A versus E is snown in Fig. 9. After reading the energetically appropriate I/A from the graph, the number was multiplied by the area of the total absorption peak of the corresponding famma ray to obtain absolute photon intensity of that line. RESULTS The absolute photon intensities with their estimated errors are listed for each gamma line of each record in Tables 2 and 3. The abbreviated sample notation used for 19