1. Numerous texts have appeared in recent years, most of them of uneven quality. Probably the best, because the most up to date, comprehensive, and critical, is Radioisotope Techniques in Clinical Research and Diagnosis;Veall, N.; Butterworth, London,1958
2. Abdou, I. A., and Tarver, H. (1951). J. biol. Chem., 190, 769 and 781.
3. Aikawa, J. K., Harrell, G. T., and Eisenberg, B. (1952). J. clin. Invest., 31, 367.
4. Los Alamos Scientific Laboratory. Report LA 1717;Anderson, E.C.; Schuch, R.L.; Perrings, J.D.; Langham, W.H.,1955
5. Anger, H. 0. (1951). Rev. Sci. Inst., 22, 912.