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21 . Seaborg, G. T.. and I. Perlman, Rev. Modern Phys., 20, 585 (1948). 



22. Trilinmr Chart of Isotopes. W. H. Sullivan, ed., Wiley, New York, 1949. 



INSTRUMENTATION' 



23. Korfif, S., Electron and Nuclear Counters. Van Nostrand, New York, 



1946. 



24. Lewis, W. B., Electrical Counting. Macniillan, New York, 1943. 



25. Lauritsen, C. C, Rev. Sci. Instruments, 8, 438 (1937). 



26. Corson, D. li., and R. R. Wilson, Rev. Sci. Instruments, 19, 207 (1948). 



27. Simpson, J. A., Rev. Sci. Instruments, 18, 884 (1947). 



2S . Neher, H. V., in Strong, Procedvres in Experimental Physics. Prentice- 

 Hall, New York, 1943, pp. 259 #. 



29. Neher, H. V., and W. W. Harper, Phys. Rev., 49, 940 (1936). 



30. Copp, D. H., and D. M. Greenberg, Rev. Sci. Instruments, 14, 205 (1943). 



31 . Brown, S. C, Nucleonics. 2, No. 6, 10; 3, No. 2, 50; No. 3, 46 (1948). 



32. Higinbotham, W. A., J. Gallagher, and M. Sands, Rev. Sci. Instruments, 



18, 706 (1947). 



33. Libby, W. F., Ind. Eng. CJiem., Anal. Ed., 19, 2 (1947); Phys. Rev., 



46, 196 (1934); 55,245 (1939). 



34. Henriques, P\ C., Jr., and C. Margnetti, Ind. Eng. Chem., Anal. Ed., 



18,417,421 (1946). 

 36. MUler, W. W., Science, 105, 129 (1947). 



36. White, L., .Jr., Determination, of Radioactive Carbon. Isotopes Division 



Circular A2, USAEC, Oak Ridge, Tenn., 1947. 



37. Henriques, F. C, Jr., G. B. Kistiakowsky, C. Margnetti, and W. G. 



Schneider, Ind. Eng. CJiem., Anal. Ed., 18, 349 (1946). 



38. Bale, W. D., and J. F. Bonner, Jr., in A. Weissberger, ed.. Physical 



Methods of Organic Chemistry. 2nd ed., Interscience, New York, 1949. 



39. Solomon, A. K., and H. D. Estes, Rev. Sci. Instruments, 19, 47 (1948). 



ERRORS AND CORRECTIONS 



40. Reid, A. F., A. S. Weil, and J. R. Dunning, hid. Eng. Chem., Anal. Ed., 



19, 821 (1947). 



41 . Rainwater, L. J., and C. S. Wu, Nucleonics, 1, No. 2, 60 (1947); 2, No. 



1,42 (1948). 



42. Yankwich, P. E., T. H. Norris, and J. Huston, ///(/. Eng. Chem.. Anal. 



Ed., 19, 439 (1947). 



43. National Bureau of Standards, Nucleonics, 1, No. i, 63 (1947). 



SPECIAL PROBLEMS 



44. Hahn, O., Applied Radiochemistry. Cornell Univ. Press, Ithaca, New 



York, 1936. 



