The spectral distribution of the Čerenkov radiation induced in deionized water by gamma rays from Coll has been obtained. A 3400-curie Co<sup>60</sup> source provided adequate light emission in the water surrounding it to allow a direct measurement with a grating spectrometer. In the observed spectral range, 3200A to 6000A, the spectral distribution is in agreement with the prediction of the Frank and Tamm theory and is offered as a quantitative check on this theory.
J. A. RICH, R. E. SLOVACEK, and F. J. STUDER, "Čerenkov Radiation from a Co60 Source in Water," J. Opt. Soc. Am. 43, 750-750 (1953)