COMMUNICATIONS TO THE EDITOR 569 . which was alongside the 800-mg. samples during each irradiation.Since the success of the Szilard-Chalmers reaction is known to be dependent on the level of the y-radiation in the pile it was desirable that all samples be irradiated under the same conditions.2 The tetraphenyltin samples used in experiments 1 and 2 were alongside each other in the pile during the irradiation as' were the samples used in experiments
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