About two years ago my attention was called to a letter published by Prof. E. Rutherford in Nature. Oct. 6, 1906, in which he points out that cocoanut charcoal has the property of absorbing and retaining for some time the emanation of radium, thorium or actinium. In this letter it is stated that cocoanut charcoal retains the emanation at ordinary temperatures, for Professor Rutherford finds that the emanation retained in charcoal in a tube open to the air loses its activity at the normal rate observed in sealed vessels. Further, he says:
In a recent investigation I had occasion to pass the radium emanation through a tube filled with cocoanut charcoal, and was surprised to find that the emanation was completely absorbed by it. If a slow current of air, mixed with the emanation of radium, thorium, or actinium, is passed through a tube filled
SHOBER JB. EMANATION OF RADIUM ABSORBED AND RETAINED BY COCOANUT CHARCOAL: AN ADVANCE RADIUM THERAPY. JAMA. 1909;LIII(8):624–628. doi:10.1001/jama.1909.92550080003002e
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