1. For reviews, see Taplin, G. V., in “Radiation Dosimetry”, G. J., Hine, and G. L., Brownell, editors, (Academic Pres, Inc., New York, 1956). Price, W. J., “Nuclear Radiation Detection” (McGraw-Hill Book Co., New York, 1958).
2. Day, M. J., and Stein, G., Nature, 166, 146 (1950).
3. Swallow, A. J., J. Chem. Soc., 1553 (1957).
4. Armstrong, W. A., and Grant, G. A., Radiation Res., 8, 375 (1958).
5. Broyde, B., and Oster, G., J. Amer. Chem. Soc. (in the press).